This poor soul didn't spot me fast enough. Sent out his radio report of periscope sighted and one second later his ship was toast
possible radio messages that a ship can give off when destroyed/sinking:
SOS....SOS.....SOS.....We're going down at (lat, long)
Abandoning ship at (lat, long)
Massive damage. Ship is taking on water. Abandoning ship at (lat, long)
Unable to control flooding. Abandoning ship at (lat, long)