Showing posts with label buoyancy. Show all posts
Showing posts with label buoyancy. Show all posts

Wednesday, August 3, 2016

How to be a Good Dive Buddy

Diving with a buddy is more practical, safe, and fun.  © PADI 2016

Dive buddies are great.  They are someone to travel with, someone to explore with, and someone to create new memories with.  They may be your boyfriend or girlfriend, husband or wife, your kid, your mom or dad, your friend, your co-worker, or someone that you just met!  The purpose of a dive buddy is to make your dives more practical, safe, and fun.  But do you know what it takes to be a good dive buddy? 

Practice your buoyancy © PADI 2016

Mask skills should be practiced often - Image by TauchSport_Steininger via Flickr

1. Stay sharp on your own skills so you can help yourself and your buddy 

Make sure you are up to date with all of your dive knowledge and skills.  Just because you are certified does not mean that you don't have to practice.  Read our blog "Skills every diver should practice."  It is also very important to stay fit for diving.


Know your buddy's equipment © PADI 2016

2. Be familiar with your buddy's equipment

Know how to release your buddy's weights in case of an emergency, and be familiar with your buddy's alternate air source in case you need to use it.  If your buddy has an underwater signaling device to get your attention, make sure you know what to listen for.


Image by Vera Kratochville via Public Domain Pictures

3. Don't pressure your buddy into a dive (s)he is not comfortable doing 

Staying within your training and personal limits will help to keep you safe.  Respect your buddy's limits; they may be different than your own.  Emergencies happen much more often when you dive outside of your training or personal limits.


Pre-dive safety check with your buddy © PADI 2016

4. Do a pre-dive safety check with your buddy before every dive 

Practice good habits to prevent accidents before they happen.  Do a buddy check together, remembering BWRAF.

B - BCD (inflate),
W - Weights (do you have them, are they secured properly, and are they balanced?),
R - Releases (all releases clipped and snug),
A - Air (Do you have a full tank, is it fully open, and can you breathe through both of your second stages?),
F - Final check (Do you have your mask, fins, and any accessories you plan to dive with?  Are conditions reasonable?  Are you both feeling up to it?). 

There are some silly sentences that can help you remember what to check.  Here are a few examples, but feel free to be creative and make up your own:

Image by Ross Little via Flickr
Big White Rabbits Are Fluffy

Image by Leonardo Laporte via Public Domain Images
Beans With Rice And Fish

Image by Yuya Salto via Flickr
Burgers With Relish And Fries

Image via Wikipedia
Blonde Women Really Are Fun

Image by Parafly via Pixabay
Brunette Women Really Are Fun

Image by Loren Javier via Flickr
Bruce Willis Ruins All Films

Once you have made the pre-dive safety check into a habit, it will become quick and easy.  I can't even count how many times I've seen even experienced divers jump into the water without doing a pre-dive safety check.  At the least they look like a fool when they hit the water and they forgot something important.  At the worst it can lead to an emergency.

Descending with buddy © PADI 2016

5. Descend with your buddy 

A good buddy stays at the same level with his/her buddy while descending.  Even if your ears are capable of equalizing rapidly, don't rush down to the bottom.  If your buddy has a problem and needs your help you won't be there to help him/her.  While you're sitting on the bottom waiting for your buddy, you're chugging through your air because you consume more air at depth. You are also absorbing more nitrogen at depth, and wasting no-decompression time while your buddy makes his/her descent.

Stay close to your buddy © PADI 2016

6. Stay with your buddy during the dive 

Though you don't have to hold hands during the dive, you should always be within about 10 feet or less (depending on visibility).  This is to avoid buddy separation, and to be readily available for one another in the event of an out of air emergency.  Work on your buoyancy control, though, so you're not constantly running into one another.  It feels very claustrophobic to be constantly colliding with your buddy.  There is no reason to rush on a dive.  The slower you go, the more you usually see.  Don't make your buddy have to struggle to keep up with you.


Share interesting encounters with your buddy © PADI 2016

7. Share the interesting things you find with your buddy 

One of the most fun things about diving is finding interesting fish and creatures.  Make sure your buddy sees what you are looking at so you can share the experience.  There are many hand signals for fish and creatures, and they are fun to learn.  You can make up your own, too!


Alternate Air Source Ascent © PADI 2016

8. Check your buddy's air 

Check your buddy's air from time to time.  It is important to know how much air your buddy has so you can both get back to the boat or to your exit point with at least 500-700psi of air left.  Avoid running out of air, since it puts both of you in unnecessary danger. 


Safety stop with your buddy © PADI 2016

9. Ascend with your buddy 

At the end of your dive, ascend together with your buddy.  You should both get into the habit of doing a 3 minute safety stop at 15 feet before ascending, and ascending slowly from every dive - no faster than 1 foot per second.  Remember to deflate the expanding air from your BCD's as you ascend so you are always in control and never being buoyed up by your BCD.  As soon as your heads touch the surface, make sure you both inflate your BCD's so you are positively buoyant and not in danger of sinking back down.  Grab onto the line behind the boat if you are boat diving so you don't drift away.


Log your dives with your buddy © PADI 2016

10. Log your dives together & talk about them

Every dive can be a learning experience.  Even though you are certified, you are never finished learning.  Was there anything either of you could have done differently?  Did you stick to your dive plan?  How clear was communication with your buddy?  Are there any skills either of you should work on?  Did you see any new fish or creatures?  Talk to your dive guide, grab a book from your local dive shop, or go online to find out what interesting new creatures you saw.  


The ocean is an amazing place, and is best when shared!  Now you know how to be a great buddy!

Dive buddies © PADI 2016




Wednesday, July 27, 2016

Things that Sting and How to Avoid Them - Part 2 - Fire coral & Stingrays


Disclaimer - I am NOT a doctor.  I am just a scuba instructor who has been around for a while and has seen (and been stung by) a lot of things.  This is not meant to replace professional medical advice or replace visiting your doctor or calling the professionals at Diver's Alert Network for advice.  If any of your symptoms are severe or are affecting your breathing or pulse, please get yourself to a hospital immediately!  

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FIRE CORAL

Image by Nhobgood Nick Hobgood via Wikipedia

FIRE CORALS - They come in many shapes and sizes, but their brownish orange color helps distinguish them from the other corals.  Fire corals are not true corals.  They secrete a hard skeleton and add structure to the reef like other corals, but they are more closely related to jellyfish.  Among the more commonly seen types of fire coral are branching fire corals and encrusting fire corals.  

Image by Nhobgood Nick Hobgood via Wikipedia

Image by Derek Keats via Wikipedia
Branching fire corals often have white coloration near their tips.  Encrusting fire corals can form on anything that has been underwater for an extended period of time.  Fire corals can encrust on mooring lines, dock pillars, rocks, shipwrecks, sea weed, and even other corals.

Image by Public.Resource.Org via Wikipedia

If you look very closely you can see tiny white hairs or bristles coming from the fire coral.  Each of these fine hairs contains a "nematocyst" that is barbed and contains a toxin.  Fire corals use their barbed toxic nematocysts by shooting them out to paralyze their prey (plankton) as well as to defend themselves against potential predators when they get too close.  It's these almost microscopic nematocysts that stick in your skin and cause you extreme pain when you touch fire coral.  

Image by Steel Worker 2nd Class Metro Sayre via Wikipedia
Image by Amy Kelley

To avoid getting stung, cover your skin with a rash guard or a wetsuit and keep a safe distance from the reef.  If there is a lot of surge, give an even wider cushion of safety.  Divers should practice good buoyancy control, and consider taking PADI's Peak Performance Buoyancy course to improve their control in the water.  Be aware that fire coral can encrust on any underwater surface, so avoid touching, brushing into, or grabbing onto anything underwater.  It is important not to touch things underwater for conservation purposes too - you don't want to harm any underwater organisms!  If you find it necessary to hold onto a mooring line and you are not wearing gloves, look at the line carefully before deciding where to grab it.  Avoid the parts of the line that seem to be covered in hydroids or fire coral.  Instead of grabbing the line with your whole hand use what I like to call "shrimp claws."  That means grabbing the line delicately with just two fingers.

Image by Derek Keats via Flickr

In saying that, I have been stung by fire coral numerous times.  I can tell you from personal experience that it does feel like fire.  It is not pleasant at all.  For me, the pain is usually very intense and gives me a head rush because it triggers endorphins to help my body cope with the pain.  I am usually with students or guiding divers when it happens, so I do my best to suck it up and pretend like nothing happened.  It most often occurs when there is significant surge and I am focused on helping another diver rather than paying attention to my own position in the water.

Image by Razvan Marescu via Flickr

If you do touch fire coral you will know it.  You will feel a painful, hot, fiery sting, and will probably see a welt or a rash soon after you accidentally brush up against the fire coral.  Avoid the temptation of rubbing the sting, as you will spread the toxic nematocysts around and end up getting stung even more.  Flush seawater over your sting, and when you get out of the water rinse it with vinegar.  Acids have been proven to stop the nematocysts from continuing to fire.  Later on, the sting location may begin to itch severely.  Try to avoid scratching it.  Instead, apply anti-itch medication and take Benadryl if the itching is unbearable.  Tylenol or Ibuprofen can be used to reduce the pain.  If the sting is so bad that it affects your breathing or pulse, seek emergency medical care immediately.


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STINGRAYS

Image by Barry Peters via Wikipedia
Image by Richard Giles via Flickr

STINGRAYS - Despite their reputation as man-killers after the untimely death of Steve Irwin, the Crocodile Hunter, stingrays are actually very gentle creatures.  They are by no means "out to get you."  However, people can get stung by stingrays when they feel threatened.  Every creature needs a defense mechanism to survive, and the stingray defends itself by arching its tail forward and plunging its venomous sharp barb into whatever threatens it.  Stingrays only sting out of self-defense.  In Steve Irwin's case, the stingray felt threatened because Steve hovered too closely and directly above it.  In most cases when someone is injured by a stingray, they accidentally step on one.

Image by Marek Jakubowski via Wikipedia

Image by Adamantiaf via Wikipedia
Stingrays eat mollusks, shrimp, crabs, and small fish.  They can be found along the reef, in sea grass beds, and in the sand.  They shuffle through the sand, using mostly their sense of smell and electroreceptors to find their prey.  While resting, stingrays often partially bury themselves in the sand.  Stingrays are quite incredible to watch.  They use their spiracles, the openings behind their eyes, to take in water and to expel the undigestible bits as they filter through the sand for food.  Next time you are snorkeling or diving and find a stingray, take some time to observe it, but give it plenty of space. 

Image by Tomas Willems via Wikipedia

Image by Jlwelsh via Flickr
To avoid any negative encounters with stingrays while diving or snorkeling, do not touch them or corner them.  Especially avoid hovering above them, as that is their strike zone if they feel threatened.  While hanging out at the beach, shuffle your feet through the sand so you don't accidentally surprise a stingray hiding in the sand.  

Image by Andrew Beckwith via YouTube

I cannot say firsthand how badly a stingray sting hurts, since I have never been stung by one.  However, I am certain that it is an extremely unpleasant and very painful experience.  It would be like being stabbed with a serrated knife, plus the effects of the venom.  

Image by Freebin via Wikipedia

If you get stung by a stingray, stay calm.  Remove the stinger (unless it is in a vital organ, such as with Steve Irwin).  Apply pressure to stop the bleeding.  Evaluate the severity of the symptoms, and determine whether or not emergency medical care is necessary.  Typical symptoms include pain, swelling, bleeding, and muscle cramps.  If bleeding is severe and uncontrollable or breathing or circulation are affected, consider it a medical emergency and get to a hospital immediately.  If it's not an emergency, soak the wound in hot water (but don't burn yourself!) for 30-90 minutes to deactivate the venom and relieve the pain.  You can take a painkiller such as Tylenol or Ibuprofen to ease the pain, and an antihistamine such as Benadryl to relieve itching and swelling.  Keep the wound clean and monitor it for signs of infection.    

Image by Symac via Wikipedia

Diver's Alert Network, also known as "DAN," is the dive industry's number one dive safety resource.  Every diver should have their phone number, since they are the best resource for dive safety.  They have a 24 hour emergency hotline, as well as an information line for non-emergency medical questions.  Even non-members can get free advice.  I highly recommend becoming a DAN member, since they provide affordable and high quality dive insurance, travel insurance, a monthly magazine called "Alert Diver," and a wide variety of dive safety educational resources.  

DAN Non-emergency medical information line
+1-919-684-2948
Mon-Fri 8:30am to 5:00pm EST.
+1-800-446-2671

A big "Thank You!" to our local diver John F. for suggesting this blog topic!  I look forward to hearing everyone's ideas and suggestions for future blog topics.  Feel free to leave comments on this blog or on our Aqua Action Divers Facebook page.


Wednesday, July 13, 2016

Skills Every Diver Should Practice

Image by Ahmad Faiz Mustafa via Wikipedia

How long has it been since you took your scuba certification course?  Months?  Or has it been years?  Many divers become complacent because they have been diving for "so long."  But being a safe diver has nothing to do with how long you have been diving.  The big question is, how sharp are your skills?  Are you comfortable enough that you know you can handle any problem that may occur underwater and confident that nothing will cause you to panic?  Do you remember and understand basic dive theory to keep you safe from injury and decompression sickness?  

Download the ReActivate program and do it anywhere!  ©PADI 2016

If you cannot answer "YES!" with confidence, it's time to consider Re-Activating your certification and doing a refresher course.  PADI's "ReActivate" program is a way for PADI divers to update their skills and knowledge before getting back into the water.  It's quick and easy, and personalized for you.  You download a program that goes over concepts you learned in your scuba training in a prescriptive way, so you can focus on the things you forgot.  You can do it anytime, anywhere!  Contact Aqua Action Divers or your local dive shop to get your code to download your ReActivate program and get started!  You get to keep the program forever so you can review your knowledge and skills again and again! 
 
Refresh your skills with a PADI Instructor ©PADI 2016

After you complete the digital portion of the ReActivate program you can sign up for a refresher course to practice your in-water skills with a PADI instructor.  If you complete both the digital and the in-water portions of the ReActivate course, you get a replacement certification card that says "ReActivated" on it.  Contact Aqua Action Dive Center to schedule your in-water practice time with one of our instructors!

At the absolute minimum, you should review your dive theory and practice your skills in a pool or in calm shallow water.  Here are a few of the skills that you should practice regularly because they are essential to your safety :

Image by TauchSport_Steininger via Wikipedia
No mask breathing - You must be comfortable with water around your face.  It is not uncommon for masks to leak a little bit on a dive.  Although less likely, your mask strap could break or you could lose your mask during a dive.  You must be able to stay cool, calm, and collected and avoid panicking if this were to ever happen to you. 

Image by Peter Southwood via Wikimedia Commons

Cramp release - The muscles you use when you are swimming with fins are muscles you may not use much in your everyday life.  Cramps can happen from dehydration or working a muscle more than you're used to.  Knowing how to deal with cramps in your feet or legs is important to avoid panic during a dive.  You should be able to calmly signal to your buddy, grab your fin tip, and stretch until the muscle has relaxed.

Image by Von Thomei08 via Wikipedia

Dealing with a sticky BCD inflator button - If your BCD inflator button sticks while you are on a dive, it could send you shooting to the surface and put you at great risk of decompression sickness if you do not know what to do.  Be familiar with the dump valves on your BCD so you can dump out excess air from your BCD and prevent a runaway ascent.  Practice disconnecting your low pressure inflator hose while under pressure, too, since it would need to be disconnected if you had a sticky inflator button.  To prevent your inflator button from sticking in the first place, wash your gear well after each use to make sure no salt crystals or sand can cause it to stick.  Also, have your gear serviced annually by a qualified technician.

Image by Mark.murphy via Wikipedia

Emergency weight drop - It is essential to know how to quickly get rid of your weights in an emergency.  For example, if you are on the surface and you cannot keep your head above water and your BCD is not inflating you need to drop your weights to get positively buoyant.  Being familiar with your weight system and knowing how to quickly ditch them can save you from drowning.

Image via Pixabay

Buoyancy control - Poor buoyancy control while diving can lead to ear injuries (read "10 Tips to Prevent Ear Injury"), decompression sickness, lung over-expansion injury, rapid air consumption, hyperventilation, injuries resulting from running into sea urchins or coral, and damaging the reef.  Buoyancy control is the skill that takes the most practice to master, but once you master it your dives will be immeasurably more safe, relaxing, and enjoyable.  

Image by Peter Southwood via Wikipedia

Alternate Air source use  - Although running out of air should never be an issue if you pay attention to your air gauge, it is important to practice using your buddy's alternate air source and having your buddy breathe using your alternate air source.  You should also practice swimming together while sharing air, since it is awkward and does takes team work and coordination.  In the unlikely event that you or your buddy do run out of air from a dive, being able to confidently perform this skill could save you or your buddy's life.

Which of this skills do you feel most confident with?  Are there any of these skills you haven't practiced in a while?  What are you going to do to make sure your skills are sharp before your next dive?  What other skills do you think should be on this list?


Wednesday, July 6, 2016

10 Tips to Prevent Ear Injury

The most common injuries in scuba diving are ear injuries.  Pressure increases with depth, and you must be able to "equalize" your body's air spaces to avoid injury.  Equalizing means making the pressure inside your body's air spaces match the surrounding ambient pressure.

HERE ARE 10 TIPS TO PREVENT EAR INJURY

Image by Vera Kratochvil via Public Domain Pictures

1. DO NOT DIVE WHEN CONGESTED - If you have a cold or allergies, mucus fills your body's air spaces, making it difficult or impossible to equalize your ears and sinuses.  Air needs to be able to move freely through your ear and sinus air spaces in order to make the pressure inside of your body's air spaces equal to the surrounding pressure.    

Image by ParentingPatch via Wikimedia

2. ONLY USE MEDICATIONS WITH EXTREME CAUTION -  Some divers like to take a decongestant such as Afrin or Sudafed before a dive.  These medications help to clear up congestion, but if the congestion returns during the dive you may have another problem to contend with - reverse block.  Reverse block can happen if you are ascending and the expanding air cannot be released from your body's air spaces.  Be careful to take decongestants close enough to your dive time so they are effective, but not too early so they do not wear off during your dive.

Image by Mojpe via Pixabay

3. REDUCE MUCUS BEFORE & DURING THE DIVE - As disgusting as these ideas may sound, they work.  Prior to descending, blow your nose to clear the mucus from your sinuses.  "Hock a loogie" to clear your Eustachian tubes of phlegm.  This will make equalizing easier during your descent.  But mucus may re-accumulate, and you may need to get rid of mucus during the dive, too.  I remove my mask while underwater to blow my nose and clear my air spaces of mucus, and it works for me.  I would only recommend this for divers who are very comfortable removing their mask underwater.   


Image by H. Zell via Wikimedia
Image by Kruscha via Pixabay
Image via Pexels



















4. AVOID SUBSTANCES THAT CAUSE EXCESSIVE MUCUS PRODUCTION -  Consuming milk products, tobacco, and alcohol cause your body to create more mucus.  If you are someone who tends to have trouble equalizing, avoid drinking milk or having other dairy products before a dive.  Smoking and drinking alcohol should always be avoided before and after diving.  Smoking and drinking cause mucus to form, make it harder to equalize, and increase your risk of decompression sickness.

Image by Waltermera182 via Wikipedia

5. KNOW VARIOUS EQUALIZATION TECHNIQUES - Most divers know the "jaw wiggle" technique, the "swallow" technique, and the "pinch your nose and blow gently" technique.  Relaxing your face and neck muscles while trying to equalize can make a big difference, too.  Relaxing your muscles allows air to move more freely through your air spaces, while tense muscles can prevent equalization from happening.  You can tilt your head to the side to elongate your Eustachian tube, the tube that connects your ears and sinuses to your throat, while trying to equalize.  You can also massage your Eustachian tube to help air pass through for equalization.  This works great if you have one stubborn ear, but can also be used for two stubborn ears if you alternate sides.  You can combine these techniques for even better results.  For more techniques, read Diver Alert Network's The Diver's Complete Guide to the Ear.

Image by Nathanial Kelley

6. ALWAYS DESCEND SLOWLY AND CONTROLLED -  Most divers descend way too quickly, and put themselves at high risk of barotrauma, pressure related injuries.  You should think of your descent like descending a ladder, rung by rung.  Go slowly, equalize every two feet, and be able to stop immediately if your ears do not equalize to the depth of that rung.  If you are having trouble equalizing, go up only two feet (one rung of the ladder).  Going up more than that will cause unnecessary and dramatic pressure changes to your ears that are likely to hurt you.  Many divers are totally unaware of exactly how much they are going up or down.  Looking at your depth gauge, or better yet, your dive computer, can help you make sure you are not going up or down too far or too fast.  

Image by Amy Kelley
 
The best way to assure a slow, controlled descent is to use a descent line and climb up and down that line with your hands while you equalize.  If surface conditions are choppy, remember that you shouldn't let the line jerk you up and down.  Move your arm up and down with the waves, while your body remains at a constant depth.

Image by Amy Kelley

7. DESCEND FEET-FIRST -  That will allow air to rise up your Eustachian tubes and mucus to drain down.  If you descend in an inverted position you will probably need to equalize more forcefully, which can lead to ear damage.  Always equalize gently.

Image by Julie Holmes via Pexels

8. EQUALIZE PROACTIVELY -  Try equalizing before your dive to make sure your ears will cooperate.  Some experts say that if you practice equalizing hours before your dive, it will be easier for you to equalize during your dive.  If you are unable to equalize on the surface, you will not be able to equalize underwater - and you should not dive.  If you gently equalize right before you begin your descent (pre-pressurize) it may help you to equalize past those first few feet which are where the pressure change is the most dramatic.  Equalize before you feel any pain or discomfort and never force an equalization.

Image by Amy Kelley

9. SWIM SLIGHTLY ABOVE THE GROUP -  If you are having a hard time equalizing but the rest of the group is beginning their dive, you can still stay with the group but at a shallower depth.  This way you won't float away into the deep blue by yourself while trying to equalize, and you will not stop the group from beginning the dive.  Be sure to signal to your dive guide that you are having trouble with your ears and that you will swim above the group.  Take your time equalizing and descending, and only descend to a deeper depth when your ears are ready. 

Image via Pixabay

10. GET CONTROL OF YOUR BUOYANCY - Good buoyancy control will help you to be in control under the water.  With good buoyancy control you will have slow descents and ascents, be able to stop at any given depth if necessary, and be able to stay at a constant depth.  Divers with poor buoyancy control tend to accidentally float up and sink down many times during a dive, subjecting their ears to unnecessary pressure changes.  Consider signing up for a Peak Performance Buoyancy course with Aqua Action Dive Center or your local dive shop.


Remember these 10 tips next time you go diving, and enjoy a fun and pain-free dive!  To learn more, read Diver Alert Network's Guide to Avoiding Ear & Sinus Injuries in Scuba Diving

Image by BruceBlaus via Wikipedia