Lure_Angler

Dear all,

I've been reading the US Navy Diving manual and at the same time cross referencing it with Britsh (1964. BR 2806) and Australian (1966. ABR 155) Navy Diving manuals.

In the US manual, they have somethng called single depth limits. Some of the max dive time and depth limits it suggested are as follows:

25 ft --> 240 minutes
30 ft --> 80 minutes
35 ft --> 25 minutes
40 ft --> 15 minutes

However, the Britsh and Aussie manuals mentioned nothing about such limites. The only thing they mentioned was the 25 feet maximum depth limit. No mention about maximum dive time at that depth.

My question is: Are the times and depth limits as sugested by the US navy accurate and safe? Why is it that the other navies don't have them? I am particular interested in the validity of the 25 feet/240min and 30 feet/80min limits.

My theory is this: I think they are safe if the US navy (which is published more recently , I suppose) have the equipment and capability to extensively test the limits which was not available to the other older navy diving manuals.

TC