Bucear en Koh Tao

By , 25 September, 2015, No Comment

Bucear en Koh Tao es una de las experiencias mas bonitas que puedes hacer en tu vida. La libertad y la ingravidez que nos proporciona el estar bajo el mar son sensaciones incomparables.
A parte de las sensaciones generadas, también podemos disfrutar de la incomparable vida marina que tenemos en la isla.

Con Davy Jones Locker centro PADI ***** podrás visitar los diferentes sitios de buceo que hay en isla tortuga. Inmersiones semanales en Chumpon, Southwest, Shark Island …  entre otras, harán que disfrutes como nunca del fondo submarino.

Algunos de los animales que puedes encontrar y “sentir” en Koh Tao, son estos curiosos Labroides Dimidiatus , conocidos oficialmente como “Cleaner Fish”

Estos pequeños se han especializado en limpiar parásitos y tejidos muertos a los peces del arrecife.

Este pequeño comilón es un amigo muy querido por todos los habitantes del mar, ya que vive agrupado en colonias en las que permanentemente se acercan peces de todas las especies y tamaños para que los libre de los parásitos, de los cuales se alimenta. Actualmente podemos encontrar muchos de ellos, especialmente en sitios como White Rock, Mango Bay, etc. Estos granujas ya han aprendido que los humanos también tenemos pieles muertas y parásitos, así que no dudan a la hora de limpiarte tus heridas y pellejitos. Son totalmente inofensivos y muy divertidos!










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Considerations for ‘How Much Gas’

By , 21 September, 2015, No Comment

“1/3 in, 1/3 out and a 3rd in reserve”, “surface with a third of all your gas”, “save a third of your gas for emergencies” are typical statements you may hear when talking about rule of thirds.
The rule of thirds is variously attributed to either the pioneers of cave diving in the UK and the founders of what was to become the Cave Diving Group (CDG) or to their slightly more modern counterparts exploring the springs of North Central Florida.

Regardless of origin, the rule was used by cave divers, allowing one third of the gas supply to be used on the inward journey, one third for the dive out and a third held in reserve in case things did not go according to plan.

In simple terms it seems to work.  Looked at more closely there are flaws, albeit only minor, which need to be addressed as part of your dive plan in order to stay safe if things go wrong.

First let us look at the common belief that we should dive ‘to’ the rule of thirds.  For this example we will assume identical breathing rates and identical cylinder sizes between two dive buddies.  Should one diver have a catastrophic loss of gas at the furthest point of penetration the other diver has a third of his gas ready to donate to the out of air diver.  However if the process of the first diver trying to deal with the gas lost in the first instance takes any time or the act of sharing air and sorting themselves out for the exit takes more time, the diver donating gas will have been using some of his or her exit gas already.  Those few minutes to get organised for the swim out could leave gas supplies perilously close to the limit or even being exhausted prior to the team reaching safety.

What if the air sharing swim out of the cave takes much longer just because the long hose has been deployed?  What if the two divers did not have identical breathing rates?  If the out of air diver has a measurably larger breathing rate then the donor diver’s reserve third might simply not be enough gas!

How can we plan to avoid these potential pitfalls?

Firstly we can look at how we might apply the rule of thirds before we discuss other planning considerations.  When I said that many divers will dive to the rule of thirds the implication is that they will turn the dive when the hit the point of having used 1/3 of their gas.  But turning around takes time.  Making sure everyone on the team has seen the signal and they too have turned takes time.  All this is eating in to the gas for the swim out and as so in to your reserves as well.

Perhaps now would be a good time to have a look at how we go about calculating our turn pressure based on the rule of thirds.

Let’s say we have a starting pressure of 210 bar.  That one is nice and easy, 210 divided by 3 is 70 bar, so each third is 70 bar.  70 bar from our start pressure would mean the turn pressure is 140 bar.

What if the stat pressure is not a nice easy number to divide by 3?  I know a few divers who can seemingly instantly divide almost any starting pressure by 3 and calculate their turn pressure.  I have also seen diver then use this very precise pressure during the dive when they have digital readings or pressure.  However I have also noticed how this seems to entice those divers to go right to the limit of their gas.

Simpler and safer would be to err on the side of caution and make the maths easier.  Just for fun I will look at a couple of examples.

A starting pressure of 220 bar is not easy to divide by three in your head whilst bouncing around on choppy seas discussing the dive plan and turn pressures.  Far easier is to round the number down to the next lowest number that is easily divisible by 3.  In this case that would be 210 bar.  The usual turn pressure for 210 bar would be 140 bar (210 – 70) but in this case we are starting with 10 bar more, so very simply, calculate how big 1/3 is from our rounded down pressure (70 bar here) and subtract that from your actual starting pressure. 220 bar – 70 bar would give a turn pressure of 150 bar.  70 bar in and 70 bar out would leave the ‘largest 1/3’ as the reserve, 80 bar.

What about 200 bar start pressure.  Well 195 bar is easily divisible by 3.  Each 1/3 would be 65 bar.  65 bar subtracted from your actual start pressure would give a turn pressure of 135 bar.

For some that calculation might not be so easy but there is no reason why you can’t write a list of start pressures and turn pressures in your wet-notes so you don’t have to worry that your maths isn’t so good or that you might get it wrong.

When you have calculated or looked up your turn pressure don’t just tell the team what your turn pressure is, tell them how much gas you have and then what your turn pressure will be.  That way you get a few other brains to check that you have got it right.  After all, it is their safety too that could be jeopardised if someone gets it all wrong.

Remember too that for wreck penetration dives, while still using the same approach with the rule of thirds, it is applied a little differently.  We have to take in to account the fact that having exited the wreck, in most cases, we still have an ascent to make and possibly decompression too.


At Davy Jones Tech all this information and more is covered during training, so you fully understand and you can put it into practice.


Contact us now if you want to further develop and expand your diving.

by Matt



Twin set

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Peak Performance Buoyancy

By , 14 September, 2015, 1 Comment
How often do we mention buoyancy in one day of diving? I think probably a lot! Buoyancy is probably the most important factor of being underwater, one of the main reasons is due to conservation of our reefs, some of the most amazing things to see underwater are also some of the smallest things, we want to get nice and close to view them however obviously we cannot touch! I’m sure everyone hears this before they dive… touching is a BIG no no in the diving world. Luckily using a few simple tricks of the trade we can learn to master our buoyancy so eventually it becomes easier for us to get nice and close to the underwater reefs.
There are many tricks, but pinpoint buoyancy control is the fundamental skill. Precise control of your buoyancy is what enables you to hover completely motionless, then back out of the area without using your hands at all. The real trick is to be completely correctly weighted and use your breathing to control your buoyancy. In fact, you’ll improve your buoyancy control by using your BC less, not more.

The six factors that affect your buoyancy are your ballast weight and your BC inflation, of course, and also your trim, your exposure suit buoyancy, your depth and your breath control. All these factors vary throughout a dive, the only two that remain the same are your trim and ballast weight. Some you can control, some you can’t. Buoyancy control isn’t as easy as it looks.

Lets go into some more detail about these six factors…

Ballast Weight

The ballast weight you carry doesn’t change during a dive, but it’s often the biggest problem. Many if not most divers are, carrying more lead than they need.

Most instructors during an open water course will overweight their students, it’s not a wrong thing to do, its very similar to a parent putting training wheels onto a kids bike when they are learning to ride it, only trouble is those training wheels need to be removed to progress on from the novice stage. This is a reason why the Advanced course is so advantageous to most open water students, you learn the basics of diving during your open water then during the advanced you get time with the instructor to really refine your diving.

The first step is to just do it–take off 1kg before your next dive. Can’t get below the surface? Before you reach for the lead again, make sure you really need it. Getting below the surface, especially on the first dive of the day, can be surprisingly difficult and can trick you into carrying more lead than you really need. Here are a few tips:

Be patient- especially when wearing a wet suit, it may take time to get that wetsuit fully soaked through.

Reach up. Hold the inflator hose over your head and stretch it upward a little so its attachment point to your BC is highest. This is the main problem students have when trying to deflate, if you don’t hold that inflator hose all the way up you will still have trapped air in your BCD.

Relax. Without realising you may still be kicking your legs and moving your arms, its just nerves, without realising you are kicking your way back to the surface.

Exhale.Exhale and hold it until you start sinking, holding a lung full of air is another manifestation of nerves, it also adds a lot of buoyancy and can be the difference between going down or not, exhale and take shallow intakes of breath until you are below 2 meters.

Force it. Last method, try to force your decent by generating some downwards thrust and kicking down.


Once you are correctly weighted the most important factor to consider is your trim. Trim is your positioning in the water, we want to be completely horizontal in the water, if you try to swim with your legs slightly lower than the rest of your body then whilst your trying to kick to go forwards you are also kicking yourself to the surface. this will cause any air in your BCD to expand so when you vent this you are also making yourself negatively buoyant. if you remain in perfect trim through your dive you wll end up fiddling with your BCD a lot less and conserving a lot more air. Perfect trim is what we aim for in diving and is also helped by the Peak Performance buoyancy speciality.

Tank weight

Tank weight is another thing to consider when diving, especially when using aluminium tanks, you will be considerably heavier at the beginning of a dive than towards the end of a dive, thankfully this change of weight is gradual, so the change wont come as a surprise and you can adjust for this buoyancy change gradually throughout the dive.

Exposure suit

There is no escaping the fact that wetsuits make you more buoyant, the tiny neoprene bubbles inside a wetsuit will cause gas to get trapped and the deeper you go the less buoyant your wetsuit will make you. The good news is once you have your buoyancy dialled in at a given depth the buoyancy wont change unless you change your depth. Many people in the tropics wont wear wetsuits to avoid this problem however in some circumstances wetsuits/dry suits are essential. practise makes perfect when using wetsuits, and the thicker the wetsuit the more buoyant it will make you.

Breath control

Breath control is the most important way to maintain good buoyancy, its the way you want to learn to eventually dive, as long as you remain neutrally buoyant with lungs half full you can exhale and sink and inhale and rise, this will gradually increase the effectiveness of your air usage, if you don’t need to waste air by inflating and deflating your BCD underwater and just use your lungs to control your buoyancy it will give you longer dives.

Putting it all together

Once you have mastered all of this you can start putting this together, the best thing to do is get diving, the more practice you have the more time you have to play with your buoyancy, the end result being that perfect photo or being able to be inches away from the reef without harming it in anyway, your instructor or dive master will applaud. The peak performance buoyancy speciality will be a massive step up to helping you along the way with achieving this.

by Dani


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La magie de la plongée

By , 3 September, 2015, No Comment

Une des choses que j’aime dans la plongée c’est la garantie de ne jamais savoir ce qui va se passer… Chaque plongée est unique et absolument imprévisible. L’on croit connaitre les sites par cœur, et on découvre toujours un recoin que l’on n’avait jamais vu : une paroi magnifique, ou encore un trou sous la roche que l’on croyait pleine à cet endroit et qui, pour peu qu’on y dirige sa torche, s’avère être l’habitacle de milles merveilles… Le principe vaut évidemment aussi et surtout pour la faune. Avant de sauter du bateau, j’explique bien sûr toujours à mes élèves les poissons que nous allons très probablement croiser, mais je n’oublie jamais de leur rappeler que l’océan est vaste et vastement peuplé et que dès lors tout est possible… Et quand l’improbable se produit, les cœurs s’accélèrent sous les combis, les yeux s’écarquillent derrière les masques, les jambes cessent de palmer… Requin Baleine, jenkins stingray énorme, tortue nageant en pleine eau vers la surface, requin pointe noire… Même si je plonge toujours sur les mêmes sites, l’excitation est intacte chaque fois que je saute du bateau.












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A Technical Divers Skills Pt 2

By , 30 August, 2015, No Comment

At Davy Jones Locker, we have a busy technical diving department that caters for people that are new to the discipline and experienced technical divers. Your foundational scuba diving skills need to be second nature so when an emergency arises you can focus on solving the problem and aborting the dive. I feel these six essential skills should be practiced on every dive, whether you’re a experienced technical diver with 1000’s of dives under your belt or someone just starting out.

  1. Predive Check, Descent/Bubble Check, and S-Drill– While there are three skill sets listed here, we group them together because the overall objective is the same for all three: start the dive properly equipped and with fully functioning equipment.
  • Predive Check – Once fully dressed for the dive, as a team, each diver runs through their own equipment to verify primary cylinders are full and valves open with turn pressures verified, stage/deco cylinders are full with regulators pressurized but valves turned off, BCD inflates AND holds gas, dive computers/gauges are turned on and functioning properly, mask/fins/weights/etc. are donned and in good condition to dive.
  • Descent/Bubble Check – Depending on conditions and site, either on the surface or on the initial descent, the team inspects each other’s equipment looking for leaks and trapped or entangled equipment.
  • S-Drill – Each team member takes turns conducting the proper gas sharing procedure with another teammate.
  • The dive does not start until all of these checks have been conducted, any complication must be resolved before continuing the descent.
  1. Trim/Buoyancy/Finning– It’s not just for looks. The importance of being able to hold your position in the water column and prevent silting-out an environment cannot be overstated; and everyone can use a little practice. Every dive, try to spend some time focusing on different finning techniques and trim/buoyancy control. Grab the GoPro and let your buddies film you so you can get some valuable feedback on what you actually look like in the water as well.
  2. Valve Drills– On every single dive, you should practice shutting down and re-opening each valve. Make sure do to this with a teammate so they can verify each valve gets re-opened. Depending on your exposure protection and recent diving activity, you may find it more difficult to reach your valves than you remember. It is important to work on this flexibility and muscle memory on a regular basis, because when you really need it is not the time to realize that you cannot reach a valve.
  3. Remove and Replace Stage/Deco Cylinders and Bottle Swapping– It is important to occasionally practice removing and replacing stage/deco cylinders in order to maintain this muscle memory. Even if the dive does not require you to stage a cylinder, practicing this skill often will speed up and smooth out the process on the dives where it is required. Going over your bottom time because you were fumbling with a stage cylinder is both embarrassing and dangerous. You should also practice swapping bottles with teammates. This can be done while decompressing by swapping stages or lean deco gasses that you are finished with between your teammates. This increases team awareness, communication, and equipment familiarity. It is extremely important to check that no hoses or equipment have been trapped by the stage/deco bottle any time you replace one.
  4. SMB Deployment and Reel Skills– Deploying an SMB and running a reel are skills that deteriorate quickly when not practiced regularly, and sloppy work in these skills can be extremely dangerous. Practice these skills as often as you can, if you don’t use it, you’ll lose it.
  5. Post Dive Briefing– It is extremely important to debrief every single technical dive. Discuss the highs and lows of the dive, where communication was good, where it was bad, and what areas can be improved upon for the next dive. You cannot see yourself in the water, so it is important everyone in the team provides some constructive criticism. This is often done with friendly banter, but it is important to remember that this feedback will help you improve your diving and safety.


While this is not intended to be an all-inclusive list of skills to be practiced for technical diving, these six skills are applicable to most technical diving scenarios, and can be easily practiced on just about every dive.

by Matt



Check out our Tech department in Davy Jones Locker at www.techdivingthailand.com









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