197.432—Surface-supplied air diving.
The diving supervisor shall insure that—
(a)
Surface-supplied air diving is conducted at depths less than 190 fsw, except that dives with bottom times of 30 minutes or less may be conducted to depths of 220 fsw;
(d)
When a diver is in a physically confining space, another diver is stationed at the underwater point of entry and is line-tending the diver;
(4)
A bell is used for dives with an in-water decompression time greater than 120 minutes, except when the diver is using a heavy-weight diving outfit or is diving in a physically confining space;
(7)
Each diver has a diver-carried reserve breathing gas supply except when using a heavy-weight diving outfit or when diving in a physically confining space; and