I had just finished getting refueled and a new load of torps from the milkcow, out of Caldiz. I was pulling away from the milkcow when I spotted someting in the water. It was darked so I hit F12 and zipped over to find.....a Dolphin!
Wish it was day time for the shot that I took.
It was swimming backwards away from the sub, squeaking and clicking away. Too cool!