I believe it's the same for any other "all crew dead" situation, such as from penetrating hits.
Wiki makes no discrepancy between crew dead by drowning and by enemy fire.
I believe you should stop playing under influence, because it's making you think you're the only expert in a game that only you play(and not that good at it, i should add).
CastorHoS is estagado/HandOfSatan?
Explains a lot.