Main Menu
Join Undercurrent on Facebook

The Private, Exclusive Guide for Serious Divers Since 1975 | |
For Divers since 1975
The Private, Exclusive Guide for Serious Divers Since 1975
"Best of the Web: scuba tips no other
source dares to publish" -- Forbes
May 2013    Download the Entire Issue (PDF) Available to the Public Vol. 39, No. 5   RSS Feed for Undercurrent Issues
What's this?

Diving Deep into Danger

from the May, 2013 issue of Undercurrent   Subscribe Now

The first dive to a depth of 1,000 feet was made in 1962 by Hannes Keller, an ebullient 28-year-old Swiss mathematician who wore half-rimmed glasses and drank a bottle of Coca-Cola each morning for breakfast. With that dive, Keller broke a record he had set himself one year earlier, when he briefly descended to 728 feet. How he performed these dives without killing himself was a closely guarded secret. At the time, it was widely believed that no human being could safely dive to depths beyond 300 feet. That was because, beginning at a depth of 100 feet, a diver breathing fresh air starts to lose his mind.

This condition, nitrogen narcosis, is also known as the Martini Effect, because the diver feels as if he has drunk a martini on an empty stomach -- the calculation is one martini for every additional 50 feet of depth. But an even greater danger to the diver is the bends, a manifestation of decompression sickness that occurs when nitrogen gas saturates the blood and tissues. The problem is not in the descent, but the ascent. As the diver returns to the surface, the nitrogen bubbles increase in size, lodging in the joints, arteries, organs, and sometimes the brain or spine, where they can cause pain and potentially death. The deeper a diver descends, the more slowly he must ascend in order to avoid the bends.

In 1956, a Royal Navy boatswain had successfully dived to 600 feet, breathing a mixture of helium and oxygen to avoid nitrogen narcosis, but he took 12 hours to resurface. Keller, by comparison, returned to the surface after his first record dive in less than an hour. He boasted of using "secret" mixtures of gases for his underwater breathing apparatus, with different mixtures designed for different depths, but he wouldn't disclose exact figures. After an editor from Life, who had accompanied Keller on his 728-foot dive, wrote an article about their accomplishment, the U.S. Navy took interest. So did the Shell Oil Company. . . . . . . .

For the rest of this great, in-depth story on commercial diving, written by Nathaniel Rich for the New York Times Book Review, go to

I want to get all the stories! Tell me how I can become an Undercurrent Online Member and get online access to all the articles of Undercurrent as well as thousands of first hand reports on dive operations world-wide

Find in  

| Home | Online Members Area | My Account | Login | Join |
| Travel Index | Dive Resort & Liveaboard Reviews | Featured Reports | Recent Issues | Back Issues |
| Dive Gear Index | Health/Safety Index | Environment & Misc. Index | Seasonal Planner | Blogs | Free Articles | Book Picks | News |
| Special Offers | RSS | FAQ | About Us | Contact Us | Links |

Copyright © 1996-2024 Undercurrent (
3020 Bridgeway, Ste 102, Sausalito, Ca 94965
All rights reserved.