Early on June 29, 1942, the 8,032-ton British steam tanker HMS Empire Mica cruised east through calm waters toward Key West, Florida, where it planned to join a convoy bound for the United Kingdom.

The hunt for lost Nazi U-Boats, and the treasures they carried, is on in History Channel’s new series “The Lost U-Boats of WWII” set to premiere Tuesday, February 27 at 10 p.m. In tonight’s episode, ...