This is better than when a US sub spotted a Japanese fishing boat in distress, then LEFT THE SCENE after radioing the info (presumably to avoid giving away its position).
That’s against the ages-old law of the sea.
I read once that subs, due to the nature of their mission are the only ones that are not subject to the “laws of the sea.” and are not expected to render aid.
Background? When? Where? What mission was the sub on? My sub was not ever to be detected and would have done the same thing, perhaps not even break radio silence.