Old Hat, you DID early on suggest that subs make a "ping" to warn others of their presence. You have also equated an accident with a mistake, which is an unwarranted assumption. Not all accidents devolve from mistakes, whether due to mechanical issues or unknown hazards - such as uncharted underwater mountaintops.
The facts here are that a sub of ours suffered an impact from something. Nobody died and the sub is in no danger. (It has probably docked by now.) Anything and everything beyond those facts is speculation. I might add that it is baseless speculation by folks - including you and I - with a total lack of experience or knowledge about submarines.
