Dive to the wreck of S/S Gullkrona.
S/S Gullkrona was a 4 masted Finnish schooner that got stuck into ice sheets near Hiidenmaa January 1941. The local Estonian people were able to recue all the crew before the ship sank. The crew eventually were able to return to Finland, after being interrogated by the Soviets.
Newspaper article: https://ekspress.delfi.ee/ajalugu/hiiumaa-meremeeste-hulljulge-paasteretk?id=72207629