Deep-Six Underwater Systems, Inc.
"Add Depth to Your Life"

Table of Contents

1 Pressure and Gases
2 The Face Mask
3 The Snorkel
4 The Fins
5 Weight Systems
6 The Knife
7 The Wetsuit
8 Pressure and Water
9 The Ear and Pressure
10 The Sinus and Pressure
11 The Stomach/Intestine and Pressure
12 The Lung and Pressure
13 Barotrauma caused by External Air Spaces
14 The Buoyancy Compesation Device (BCD)
15 The Scuba Cylinder
16 The Scuba Cylinder Valve
17 The Regulator
18 Density and the Diver
19 The 4 Gas Laws
20 Hand Signals
21 Carbon Monoxide Poisoning
22 Hyperventilation
23 Nitrogen Narcosis
24 Diver's Flags
25 Sound Underwater
26 Color Underwater
27 Decompression Sickness
28 Breathing Oxygen
29 Deep Diving
30 Thermoclines
31 Thunderstorms
32 Underwater Life
33 Open Water Dives
34 The Final Examination
35 The Environment
36 Advanced Course

29 - Deep Diving

    The lure of diving deep is there. Cruising at 100' on a wall in the tropics that descends to 3000' has a mystical attraction to most divers. The temptation to descend further is so inviting it becomes dangerous. Is it the exhilarating feeling obtained when one cheats death or just plain nitrogen narcosis? With the introduction of computers more and more divers are taking the plunge to dangerous depths. The decompression tables would not allow extremely deep dives because of the lengthy stops that had to be made on the way to the surface.

     Many feel the maximum depth for an experienced diver should remain at 130 feet. There are many reasons for that limit:

  • The pressure at 132' is 5 atmospheres absolute. The oxygen breathed at that depth is at a partial pressure of 1.05 atmospheres. At deeper depths oxygen poisoning becomes a real possibility.

  • A diver's air supply is cut to 1/5 of its normal amount.

  • Nitrogen is at a high enough partial pressure to cause significant intoxication.

  • Any contamination in the air supply, such as carbon monoxide, carbon dioxide, oil vapors, etc. are 5 times more concentrated.

  • Decompression may be required since the bottom time limits for that depth is only 10 minutes, and that counts the time descending.

  • It is darker and devoid of most color.

  • Because there is less light, there is less life.

  • And, if an emergency should occur getting to the surface at 1 foot per second is quite difficult.

Copyright Information about this text, DIVING WITH DEEP-SIX is as follows: Copyright 1996 - 2007 by George D. Campbell, III; President. All Rights Reserved. This file may be posted on Electronic Bulletin Boards for download, but may not be modified, printed for distribution, or used for any commercial purpose without the author's written permission. is using this material with the permission of Deep Six. The full version is available at:
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