What is Nitrox?

Nitrox refers to gas mixture composed of nitrogen and oxygen; which is approximately 78%nitrogen, 21% oxygen, and 1% other gases, primarily argon. The most common use of nitrox mixtures containing higher than normal levels of oxygen is in scuba, where the reduced percentage of nitrogen is advantageous in reducing nitrogen uptake in the body's tissues and so extending the possible dive time, and/or reducing the risk of decompression sickness.

About Nitrox can be listed as follow:

a) Nitrox is technically any mixture of nitrogen and oxygen, but more commonly considered to be
an oxygen-enriched mixture.

b) Oxygen-enriched air has been actively used for more than 30 years, and has existed as a concept
for more than 200 years.

c) Manipulating oxygen levels was essential to certain military operations, and became common in
commercial, scientific, and medical fields as early as World War II.

d) The National Oceanic and Atmospheric Association (NOAA) released the first publicly available
Nitrox tables in 1979, fueling the use of Nitrox in the recreational communities.

e) Nitrox gained significant recreational popularity in the early 1990’s.

f) Bottom time and/or decompression obligation is related to the accumulation of metabolically inert gasses (such as nitrogen). Since Nitrox reduces the percentages of metabolically inert gasses
in the diver’s breathing mixture, it can significantly impact bottom time and/or decompression.

g) Less nitrogen in the diver’s breathing mix allows for longer bottom times and safer dives. For
example, a 60ft (18m) Nitrox dive can last for 100 minutes as compared to 60 minutes on air.
Custom Nitrox mixtures allow divers to maximize their bottom time while reducing the risk of
decompression sickness.


Table : NO DECOMPRESSION LIMITS WITH AIR AND NITROX

Technical Diving

Technical diving (or Tec diving) is a form of scuba diving that exceeds the scope (in terms of depth, bottom time and type of diving) of recreational diving and not for military application. Technical divers require advanced training, extensive experience, specialized equipment and breathing gases.

The following table gives an overview of the differences between technical and recreational diving.

Activity	Recreational Diving	Technical Diving
Deep diving	Maximum depth of 40 meters (130 ft)	Beyond 40 meters (130 ft)
Decompression diving	No decompression	Decompression diving
Mixed gas diving	Air and Nitrox	Trimix, Heliox, Heliair and Hydrox
Gas switching	Single gas used	May switch between gases to accelerate decompression and/or "travel mixes" to permit descent carrying hypoxic gas mixes
Wreck diving	Penetration limited to "light zone" or 30 meters (100 ft) depth/penetration	Deeper penetration
Cave diving	Penetration limited to "light zone" or 30 meters (100 ft) depth/penetration	Deeper penetration
Ice diving	Some agencies regard ice diving as recreational diving others as technical diving.
Rebreathers	Some agencies regard use of semi-closed rebreathers as recreational diving; others as technical diving.
Solo diving	Recreational diving requires buddy system	Solo diving

Support Marine Conservation

Here are some useful resources of Marine Conservation:
Your support are very appreciated.

Project AWARE Foundation
Teaching the world about the importance and responsibility of preserving the aquatic environment and it's resources.

Marine Conservation Society - MCS.org
MCS' vision is for seas rich in wildlife, abundant fish stocks and pollution free beaches and bathing waters – seas that are fit for wildlife to thrive in and for people to enjoy, and seas that will support future generations with abundant resources.

SeaWeb - SeaWeb.org
A multimedia public education project designed to raise awareness of the world ocean and the life within it.

The Global Coral Reef Alliance GCRA
Global Coral Reef Alliance, GCRA, a non-profit, is dedicated to protecting, growing, restoring, studying and managing coral reefs around the world.

Reef Check
Founded in 1996, Reef Check is a volunteer, ocean conservation organization designed to save coral reefs globally and temperate reefs in California. Reef Check is active in over 82 countries and territories throughout the world.

Blue Ventures
Blue Ventures is an award winning not-for-profit organisation dedicated to facilitating projects and expeditions that enhance global marine conservation and research

Dolphin Care
We aim to achieve better conservation of dolphins in the seas around Britain by involving the public in the monitoring of populations and the threats they face, hundreds of dolphins are dying every year due to By-Catch

The Shark Trust
The Shark Trust promotes the study, management and conservation of sharks, skates and rays.

Ocean Trust
Ocean Trust is a member supported, ocean conservation foundation building science, conservation and seafood partnerships to sustain the oceans as a food source for humanity.