Diving Internships | Thailand

Your set of professional scuba diving gear includes;

Diving Mask
Snorkel
Shorty Wetsuit
Complete Regulator Set
Buyancy Control Device (BCD)
Dive Knife
Safety Marker Buoy
Wetsuit Boots
Professional Diving Fins
Gear Bag

I.e. everything you need! We'll also 'chuck in' the essential DJL Diving Tshirt!!

The one optional extra which you might consider buying is a DIve Computer.

Although not essential, dive computers make scuba diving very easy, displaying a lot of useful information in one place. This includes depth, dive time, remaining available bottom time, ascent rates, safety stops and more.

There are many different models of computer, each offering unique features and benefits. If you have a little spare cash, we highly recommend purchasing a computer. We can explain the differences between different models (& get you a great deal) when you arrive here on Koh Tao, so you can make an informed decision.

Now lets take a look at the Koh Tao Resort accommodation you'll be staying in for the duration of your Thailand gap year dive internship. . .

[Or scroll down for our scuba equipment lesson!].

Know how a set of scuba gear works? Here's a free lesson from DJL!

First things first. What does scuba mean?

Self
Contained
Underwater
Breathing
Apparatus

I.e. something that you can take underwater and breathe from.

So what are the essential components of a basic scuba system?

We need a supply of air to breathe underwater, so we carry a cylinder (or tank) on our back.

These come in a variety of shapes and sizes, but we normally use a 12 litre cylinder pumped 200 times higher than atmospheric air pressure (200 bar).

200 bar is way more pressure than we can breathe in. What we need is a regular set to reduce this pressure to that of the surrounding water pressure.

The first part of the regulator set is called the first stage. This is a precision (expensive) bit of engineering which reduces tank pressure way down to something called the intermediate pressure, which it feeds down to the . . . .

This is the bit that we put in our mouth and breathe from.

The second stage contains a diaphram which fine tunes the intermediate pressure to the surrounding water pressure.

Most people are amazed how easy it is to breath from a regulator when they first start diving - there is basically no noticable breathing resistance thanks to great modern engineering.

In case our buddy has any difficulties, or stupidly runs out of air (which should never happen), we have another second stage running from our first stage.

This redundant second stage is called the alternate air scource, and means in the event of an emergency we can share air from our tank with another diver.

This makes diving very safe, and is one of the reasons why we always dive with a buddy.

To attach the tank to our back we use a kind of inflatable jacket called a BCD.

The BCD is useful because we can control the amount of air inside the jacket, thus can control whether we float, sink or hover motionlessly in mid water.

Rather than inflating the BCD manually by using air from our lungs, we can save effort by using tank air.

The low pressure inflator hose allows us to connect our regulator to our BCD, so we can use buttons on our BCD to control our buoyancy.

Takes a bit of practice to get it right!

Since our eyes can't focus underwater, we need to wear a mask.

They come in a variety of shapes, sizes and colours. Tim likes wearing his special pink mask.

A scuba diving mask has to have a nose pocket to allow you to pinch you nose and equalise your ears during descent (similar to on an aeroplane).

With all this equipment strapped to your back, it takes more effort to get around underwater.

To compensate this we use long powerful fins, that take the effort out of diving.

The best type are large, rigid full foot fins that you wear together with a wetsuit boot.

Obviously we need to monitor how much air remains in our tank. For this we use a submersival pressure guage or SPG. We normally start our dive with about 200 bar - we always keep a reserve of 50 bar, so this gives us about 150 bar to work with. This means we can dive for about 45 minutes if we go down to 20 metres.

The second instrument on our console is a depth guage, so we can always keep an eye on our depth.

It's also a good idea to know where you are going underwater.

Sometimes visibility can be low - we can never see as far underwater as we can in air, because there are lots of suspended particles.

The best solution is to use an oil filled compass, so you always know what direction you are travelling in.

Our body looses heat twenty times faster in water than in air. This means we need to wear an exposure suit to make sure we don't get cold.

Around Koh Tao, the water is normally around 30°C, i.e. a warm bath.

We can therefore use a 3MM neoprene shorty wetsuit to make sure we are adequatly protected.

The down side of wearing a wetsuit is that it makes us float.

To compensate we wear a lead weight belt, enabling us to sink at the start of the dive.

When we reach the depth that we want to stay at, we add a little air into our BCD to achieve neutral buoyancy.

Although not essential, a dive computer combines a lot of information in one place, and makes diving a lot easier.

You have your depth, bottom time and remaining no decompression time (or deco data) all on your wrist. You can even get models with digital compasses and integrated air transducers.

If you have any spare money, buy a dive computer. We have a selection in our shop on Koh Tao Thailand, (very reasonably priced)!