I believe the Navy said the Captain of the Submarine would not be held responsible for the accident because the Charts he was navigating by did not show the underwater maountain he struck
Have you got a source for that because there has been a lot of speculation about his future, including that he would be deemed responsible.
There is this:
Skipper of submarine San Francisco relieved of command
Which contains this:
Cmdr. Ike Skelton, a spokesman, said Mooney was effectively relieved but that the permanence of the move or any punitive action would depend on how the investigation into the mishap’s cause turns out.