The 80th anniversary of one of World War II’s strangest sagas — the sinking of the USS Cythera off North Carolina — came and went without notice in 2022, largely because the mystery remains unresolved. On May 2, 1942, a German U-boat sank the Cythera, then plucked two crewmen out of the Atlantic and took them to a POW camp in Prussia. Their fate is not the mystery, however. It’s what became of the ship and 69 other sailors