1943 in the USS Lapon outa Pearl. Objectives were to partol off Honshu and sink merchants. I made it to the partol area safe and souns when my lookouts spot a large old passenger liner. 3 fish later she was visiting Davey Jones locker as she was blown in half. Evading aircraft like crazy by now, when lookouts spotted a warship to the North.........Coming along big, fat and happy was a Shokaku class CV. Ye'Gads a Flattop!!!!! Dive to periscope depth.. holy cow she's alone, no escorts? :hmm: Dang what kinda luck is that? Set my course to come within 1500 yrds and go to 1/3 speed. She's coming in slow 9 kts. Fired tubes 1-5 at a range of 1000 yds (saving #6 just in case she evades.) A few seconds later 5 solid hits, planes exploding off the fkight deck........huge explosion amidships.......flight deck awash within 30 seconds and down she goes.
Set course to the north to find some more merchants to complete the goals. Found an old tanker, a large freighter. Tough buggers to sink, 3 fish each and then the deck gun. Found a few more merchants and finally got the goals complete, headed back to Pearl. Total for the patrol - 6 merchants and 1 nice big CV, tonnage = 47,000.