Because at 100 feet, most divers get narced.

Plus, a bone and joint quiz and results from our online poll.

How long will a tank last you at a given depth? Here's how to find out.

Will "Solo Diver" be the new C-card you flash on your next dive trip?

If something went wrong on your next dive, would you be the hero or the helpless bystander?

Once the exclusive tool of military and tech divers, rebreathersare now within the reach of Joe Diver. Is this the future of diving?

How trained tech divers use lines and reels to find their way into wrecks--and out of trouble.

The risks of DCS, running low on air and nitrogen narcosis increase as you go deeper. That's why you need our plan.

Put those tech-diving skills to use on these amazing sites.