First time I’ve heard of that. I was thinking of all the depth charges our subs took in WW II.
If the charge got too close it broke the hull. Never heard of any sailors dying from blast.
In the five and a half years of WWII, German shipyards built 1,156 U-boats, of which 784 were lost from enemy action or other causes. In terms of human lives, 28,000 German U-boat crew of the total 40,900 men recruited into the service lost their lives.
We have always assumed that those depth charges broke the submarine's hull and their crews drowned, but this study of the Hunley crew's remains indicate otherwise.
Damned few ever survived to document it.