indiana*joe
Registered
In an article in Scuba Diving mag, they mentioned as a problem with deep dives a concept I have heard before, but have yet to understand the physics of. Namely Self-propagating negative bouyancy at depth.
http://www.scubadiving.com/training/lessons/200307lessons.shtml
Lessons for Life
1 Deep diving requires proper training, planning, topside support and gear. Divers need a larger gas supply, high-performance regulators and high-capacity BCs.
2 Extra Weight is dangerous on a deep dive. The compression of wetsuits and BCs compounds negative buoyancy. At about 200 feet, negative buoyancy is self-propagating.
3 Rapid Descents aggravate nitrogen narcosis. The maximum safe descent rate is 70 feet per minute. Pauses allow the body to compensate for the increasing pressure.
Can anyone explain what is meant by the last sentence of item #2?
http://www.scubadiving.com/training/lessons/200307lessons.shtml
Lessons for Life
1 Deep diving requires proper training, planning, topside support and gear. Divers need a larger gas supply, high-performance regulators and high-capacity BCs.
2 Extra Weight is dangerous on a deep dive. The compression of wetsuits and BCs compounds negative buoyancy. At about 200 feet, negative buoyancy is self-propagating.
3 Rapid Descents aggravate nitrogen narcosis. The maximum safe descent rate is 70 feet per minute. Pauses allow the body to compensate for the increasing pressure.
Can anyone explain what is meant by the last sentence of item #2?