Ship Disappeared

[Zosimus]

I engaged a merchant in heavy range and scored a solid torpedo hit to the starboard side. I followed the ship for awhile yesterday but ran out of time (couldn't get TC better than 8) so I surfaced, saved, and quit.

This morning I continued the slow motion chase until the ship disappeared entirely from my hydrophone. I manned the hydrophone myself and heard no trace of the ship. I assumed that the ship had gone all stop because of the damage and so I waited a few more hours submerged. I received no "She's going down" message.

So I surfaced into the rain and waited 5 days for the rain to clear expecting to find the ship damaged and stopped in the rain expecting to finish it off when the visibility improved. However, when the rain stopped, there was no sign of the cargo ship.

Possibiltiies:

1. The ship was damaged and eventually went to 1 knot or slower and eventually crawled away in the rain and I never heard it.
2. The ship sunk but because I had saved after hitting it and before sinking it, I got no credit.
3. Something else?

Any insight would be greatly appreciated.