Torsk did indeed sink the last ship of WWII using a combination of a MK28 torpedo and MK27 Torpedo. This attack does NOT appear in her regular patrol report, but is attached as a Secret Addendum to the patrol. In the actual patrol report, if you notice on 14 August at 1209, she sighted a second frigate (ship contact 11) and commenced approach. Then at 1214, the patrol report shows that the escort made contact with Torsk by echo ranging and began an approach. The next entry in Torsk's report is at 1220, showing that she went to deep submergance and rigged for depth charge and silent running. So, the regular patrol report actually makes no mention of the MK28/MK27 attack on the ship contact 11, which turned out to be the final sinking.
Now to the secret addendum (which I have a copy of here). At 1217, Torsk fired a MK28 at the Mikura Class frigate while at a depth of 65 feet, from Tube #10. She then started deep, and 5 minutes and 33 seconds later, fired the MK27 torpedo from a depth of 180 feet, from Tube #7. Not long after the MK27 was fired, the MK28 hit the frigate, followed by the MK27. From the report: "Immediately after the Mark 28 hit, the screws and pinging stopped. One minute and 02 seconds after the first loud explosion a second was heard, which might have been the Mark 27". And further on: "One loud explosioin was heard, followed by a second lesser explosion. The screws and pinging stopped immediately after the first explosion. Loud breaking-up noises were heard on the target's bearing. The target was very close when hit, and the breaking-up noises were unmistakable".
The regular patrol report picks back up at 1245 with JK sonar picking up echo ranging at 090, with reinforcements still arriving. At 1305 she commenced evasive tactics, and so on.
I have copies of the secret addendum that I can scan if anyone is interested in seeing it. Its not part of the online patrol report on the HNSA site. I also have copies of her secret report of the transit of the Tsushuima Straits, when she penetrated in to the Sea of Japan through two minefields using instruments only! That is also not part of the regular patrol report.
Kind if makes you wonder about all the other secret addendums that arent part of the regular patrol reports for all the boats that made war patrols. There has to be plenty of them, much more that is currently available online!
Gil
