[solitas]

That's interesting. I hadn't known that about today's torpedoes.

However, the initial posting was with regard to a nuclear device and, I didn't think about it until after my posting: I wonder if just the initial impulse from the explosion ('way before the bubbles got there to upset bouyancy) would kill the hull - water being a good low-freq coupling mechanism and the acceleration/impulse being so high and well distributed?

[Fitzcarraldo]

Test: Umbrella 
Time: 23:15 8 June 1958 (GMT)
11:15 9 June 1958 (local) 
Location: Enewetak lagoon 
Test Height and Type: Underwater, -150 feet 
Yield: 8 kt 

Umbrella was a DOD sponsored weapons effects test for a medium depth underwater explosion. A Mk-7 bomb was used for the test (30 inches in diameter, 54 inches long, device weight 825 lb.) in a heavy pressure vessel (total weight 7000 lb.). Very similar to the Wahoo device. The device was detonated on the lagoon bottom NNE of Mut (Henry) Island. An underwater crater 3000 feet across and 20 feet deep was produced.