Sure. The people who said they have drowned probably think the same. But it doesn’t mean that they have carefully considered all the possible failure modes of a submersible and postulating that one which leads to a drowning is the most likely in this case. It expresses more a vibe that the speaker thinks they are dead.

But why not make it more concrete. Can you find a single example where someone says that they have drowned and the speaker means it as a carefull engineering analysis regarding failure modes, as opposed to a general vibe of “they dead”?