Just to do a little more testing I left the ship that I couldn't sink, traveled way up from Surabaya to northern Formosa Strait. Several days passed and I eventually found a target. Nailed the Merchant target with 4 forward fish and no sinky.
Unloaded all 150 HE rounds into him, more than half hit, and other than that baby looking like a piece of swiss cheese nothing else is happened.
Lined up aft torpedo on opposite side of first hits (port) and got 3 hits 1 dud. Still nothing.....
Hmmmmm....very weird. May need to restart my patrol and do some further testing.
Thanks.
Sudo