Locations
Chuuk (Truk) Lagoon: Technical Diving the Hailstone Fleet
More than 50 WWII wrecks from 3 m to 64 m, a volunteer-run chamber and a 2025 oil leak. What technical divers need to know before diving Chuuk's Hailstone fleet.
Section
Deep/Trimix
Deep and mixed-gas diving
No articles on this page match that filter.
Locations
Émergence du Ressel
A river resurgence in south-west France that has drawn cave divers for decades. Shallow galleries lead to deep shafts, and the dive can be as simple or as serious as you make it.
Locations
Chuuk Lagoon
A Japanese fleet sunk in 1944 lies in the warm water of a Micronesian lagoon. It's one of the world's great wreck-diving destinations, and one that deserves respect.
Gear
Two computers, or tables?
Dive computers now run full trimix decompression. Should you trust two of them, or plan the dive on paper and dive the plan? Most divers do some of both.
Safety
Rule of thirds or minimum gas?
Two ways to decide how much gas to keep in reserve. One is simple and proven in caves. The other is calculated for the dive. Here's how each works, with a worked example.
Safety
Deep stops after the NEDU trial
For years, stopping deeper was thought to be safer. A 2011 US Navy trial challenged that, and decompression practice has been shifting since. What the evidence says, and what it doesn't.
Safety
Gas density: the limit you don't plan for
Most divers plan for oxygen and narcosis. Fewer plan for how thick their gas is at depth. Research published in 2016 suggests they should, especially on rebreathers.
History
From Haldane to Bühlmann
The decompression model in your computer has a family tree going back more than a century. A short history of how we learned to come up.
History
Sheck Exley and the rules of cave diving
The most influential cave diver of his era set depth records, wrote the rules that still save lives, and died pursuing a 1,000-foot dive. A profile.
History
Helium: how a rare gas opened the deep
Nitrogen made deep diving on air dangerous and unpredictable. Helium changed that, first for navies and oil companies, then for technical divers.