Technique Diving or Tek Diving
There are mainly three type of tek diving. Nitrox diving, Rebreather diving and Ice diving. It is important to have undergone some training before taking these type of dives.
The nitrox used by a diver is in fact air where the oxygen has been enriched 30 to 50%. This is done to counteract the toxic effects of nitrogen which can arise at depths of 30 metres. The mixture used doesn't let you dive much deeper than this as its effects will not be felt after a certain depth. On the other hand you will be able to dive for a lot longer than from a surface dive.
Rebreather uses a nitrox mix and one of its advantages is rebreather does not emit bubbles the way open-circuit scuba does, divers are quieter and can interact more freely with marine life.
The technology used in this device, recycle the air exhaled by the diver, thus increasing the air supply underwater. The air supply of such units lasts from about 45 minutes to 2 hours. Exhaled air passes through a regeneration chamber; carbon dioxide is removed; the air is then combined with oxygen and air from the cylinder; and then it is rebreathed.
For ice diving one will need specialised technical equipment. It's necessary to wear a dry suit as the waters temperature averages around the 0° mark. Using a recovery cord is vital, if you want to find your way back to the surface that is! Ice dives aren't something you do off the cuff; preparation and organisation are vital. Some clubs in France and abroad can offer these types of dives.