Mixed gas training can be broken down into several different classifications. There is no class or certification called “mixed gas.” Mixed gas is typically classified as the combination of helium, nitrogen, and oxygen, which is called trimix or just helium and oxygen, which is called heliox. Trimix is quickly becoming the more popular mix for technical divers today.
What is Nitrox?
Nitrox is any combination of oxygen and nitrogen. The air you breathe today is a form of Nitrox, which is 79% nitrogen and 21% oxygen. Nitrox mixtures with greater than 21% oxygen are referred to as Enriched Air Nitrox (EANx). The “x” refers to the percentage of oxygen in the mixture. The most commonly used Nitrox mixtures are EAN32 (32% oxygen and 68% nitrogen) and EAN36 (36% oxygen and 64% nitrogen).
An underwater housing is what keeps your camera dry at depth. This is a critical job, since one drop of saltwater hitting the camera in the wrong place can destroy it. The prominent companies making housings generally have this problem well solved by design, else they wouldn’t be in business very long. However, being a dependable moisture barrier is not the only important quality to look for in housings. There are other key features and characteristics that, if absent, can really limit the capabilities and enjoyment of your underwater video system. We’ll look at all these areas to help you make a choice that’s right for you.
Pete started diving in 1971 exploring the calm, balmy water off of Long Island NY. His interest in photography started in 1976. The equipment available to him was a Minolta SRT 201 in an Ikelite housing with a simarly housed Vivitar 283 flash. “I started photpgraphy to help explain to my parents why I was spending so much time in the water. Long Island NY is a great place for wreck diving and since I wasn’t traveling to the islands, I used what was available.” Pete specialized in NE wrecks and animals and coupled with his speaking ability found himself on the lecture circuit in 1983. An interest in cave diving led to photography in the same environment and eventually working for Dive Rite. His articles and photos are internationally published in a variety of media