- it fits to my infos tooThe V80 was sent from Kiel to Hela in late 1940. Experimental rides were undertaken from there in 1941 and 1942. It seems, that V80 went into storage at Hela following these trials and it was sunk by German troops in March 1945 near Hela.
Question is where exactly it was sunk but it is offtopic.
Object provided in Your last answer is near Jastarnia/Heisternest.It is related to Torpedowaffenplatz Gotenhafen- Hexengrund and Torpedoverschusanschalt Oxhofte-Kampe n.Gotenhafen.
It seems that it was object for observation topredo test trials or/also for morring ships that were taking torpedos after they been shooted.Bunker lays direct on the line of shooting.
Brgds
@ndrew