Should you breathe air, nitrox or trimix? It depends on the dive. See how nitrox and trimix stack up against the stuff you're used to inhaling.

It may be your ticket to underwater freedom.

Make your next dive cruise your best vacation ever.

The hottest, coldest, longest, deepest and highest dives in the world. The world's superlative sites and the people who pioneered them.

Our technical editor confronts myths about rebreathers and argues that semi-closed systems make sense for recreational divers.

Does your tank have enough air for your next dive? Find out.

Wreck diving skills Houdini would love.

Decompression diving can take you to greater depths, and your skills to a whole new level. Are you ready to push the limits?

Because at 100 feet, most divers get narced.