Archive for ‘Training’

Unicorn Wreck diving with DJL Tech crew

By , 22 April, 2016, No Comment

Unicorn Wreck diving with DJL Tech crewDavy Jones Locker instructor Matt is also a certified tech diver and has written a new article for the DJL Blog. The tech crew visited the Unicorn Wreck near Koh Tao for some experience diving and also to complete the training of students taking tech courses

 

 

Unicorn Wreck diving with DJL Tech crew“The DJL Tech crew have been diving the Unicorn Wreck which is located around 4 nautical miles North of Koh Tao in around 48m of water. Preparation for the the dives began the day before with the checking of equipment, mixing and analysing gasses, and dive planning. It was then a nice early start to move the equipment down to the beach, on to the longtail, which would then take the team to the bigger tech boat.

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Wreck Spec advice

By , 10 April, 2016, No Comment

wreck spec adviceDavy Jones Locker instructor Dani recently took one of our Divemaster candidates Kieran through his Wreck spec,  following that she has written a new article for the DJL Blog containing some great wreck spec advice. Wreck exploration and penetration is one of the most exciting aspects of diving but does have some inherent risks and dangers that divers need to be aware of.

 

“Danis Wreck spec tips :

For many divers the greatest thrill is exploring ship wrecks. But, as you progressed through your open water training, you were no doubt constantly reminded about the dangers of entering wreckage or any overhead environment. The dangers are real and valid whether you are a relative new comer to diving or a seasoned dive professional with many thousands of dives.

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CCR Cave Diving Song Hong

By , 30 March, 2016, No Comment

CCR Cave Diving Song HongBeing an open circuit cave diver and enjoying the challenge of the deep caves of Thailand I have for a long time wondered about the benefits of closed circuit rebreather technology in relation to caves. As CCR divers will tell you the units work best in a classic diving profile (max depth work shallower) and when a diving colleague Bruce Konefe took me on a course, ANDI CCR cave, I was intrigued to learn about the gas management rules for cave profiles as caves tend to follow their own profile without regard for the divers.

The cave where we were to complete our training, Song Hong, is a huge sink hole slap bang in the middle of Thailand. Song Hong is well known with local cave divers and stands out for its’ enormous size and depth with exceptionally clear water below the hydrogen sulphide layer. Part of the sink hole which allows for direct access to the surface is used by technical divers wishing to complete wishing to complete deep trimix diver training, avoiding the problems associated with currents and elevating respiration in the sea.

ccr cave diving song hongAs any rebreather diver will tell you you, rebreathers, due to the design do not lend themselves to achieving good trim, a skill that is essential for cave diving. A lot of time was spent moving weights and adjusting the height of the wing to counter the lift at the shoulders caused by the counter lung. The rebreathers I had with me, Evolution and Inspiration, due to the box they are protected by make it hard to move weights and tanks, to assist in this and I found it easier to remove the can and head and put them in a customized box. This has helped a lot and now it isn’t so much effort to maintain a horizontal position acceptable for cave diving.

CCR diving song hongThankfully the gas management rules were a lot easier to master although I was surprised to see many applications of this. It depends on the amount of divers in a team and the amount of confidence in the individual team members, running from the bare minimum, carried around team members with a variation calculated at the largest RMV of this with a third reserve on top again. This is shared around the team to the old third in third out thirds developed by Sheck Exley with each team member carrying their own reserve. It can be quite unsettling when at depth and on the way in to a cave if you start to have doubts about your buddy’s ability to keep his shit together when the said shit hits the fan and you’re relying on your buddy to carry part of the emergency gas you need to get to the surface! At this point you begin to choose your buddies more carefully bearing in mind it’s the team gas rule that that has helped cave divers push back the curtain and explore deeper and longer cave systems.

CCR cave diving song hongOverall though CCRs greatly enhance the divers ability to explore caves and with careful adherence to the gas rules (whichever one you adopt) and choosing your your buddies with as much attention to detail there is no doubt CCRs take cave diving to another level. Happily, I had good diving buddies and the shared enjoyment of achieving a goal of completing the 60 metre circuit added to the pleasure.

Song Hong CCR Cave diving 2016 from bike09 on Vimeo.

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Air Consumption and Ways to Improve it.

By , 18 March, 2016, No Comment

Air consumption and ways to improve itInstructor Dani has written a new article for the DJL Blog offering some great tips on how make your air last longer when diving. It’s not only about what you do while you are in the water, other factors such as lifestyle and preparation before a dive are also important in helping you breathe underwater efficiently.

 

“Are you constantly finding you are turning your dives based on your air supply? fastest air consumption compared to your buddy’s on the boat? wanting to spend those extra few minutes with that turtle?

You may never have the best air consumption on the boat but you can have the most improved. Here are 10 helpful tips to help you to improve our air consumption and give you longer dives safely…

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CCR, Rebreather – Rise of the Machine

By , 5 March, 2016, No Comment

CCR, Rebreather - Rise of the MachineSince the introduction of closed circuit rebreathers to mainstream diving in the early 90’s, the rebreather doesn’t appear to have lived up to the hype. There are a number reasons for this, the equipment is expensive and so is the training when you consider the diving hours required to become proficient on these units, there have also been issues with the reliability of cells and complex electronics when mixed with water. These are factors which have made the inevitable rise of the machine slower but you can’t stop progression and eventually more and more diving schools and facilities will offer CCR training as standard.

At Davy Jones Locker we are rebreather friendly with 2 and 3 litre tanks available for rent, booster pumps for pushing up the o2 pressures needed for deeper dives and extensive training with ANDI, IANTD and in the future PADI/DSAT certification provided for the inspiration classic/evolution vision electronics.

The main reasons for choosing these units to concentrate our training on are the cost, availability and excellent support from AP Valves. The inspiration/evolution units are the most popular units on the market and have more dives completed on them than any other unit. They are constantly evolving and have many unique trademarked features, the cost is also very competitive with a very healthy second hand market with some inspiration classic units changing hands for as little as £600.

CCR, Rebreather - Rise of the MachineWe’re not claiming that these units are the Ferraris of rebreather systems like the JJ or Megalodon which come with a hefty price tag of £7000, meaning a student wishing to train on one of these would have to find around £8000 just to be able to practice after completing the course. The Inspiration/Evolution unit sits comfortably in the VW Beetle category, reliable, low cost with a healthy second hand market enabling a student after paying around £1000 for their course can continue diving for as little as £600 for their own unit.

These units are rated to 100 m and with some modifications can increase this to 150 m so there is plenty of scope for experiencing dive exploration and becoming part of the rise of the machine.

Check out our video below to see the evolution in use.

 

HMS Repulse wreck, South China sea.

 

 

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