Naval mine ship, HMHS "Britannic", which was the sister ship of the RMS "Titanic." During World War II, the U-boat fleet, which dominated much of the battle of the Atlantic, was small at the beginning of the war and much of the early action by German forces involved mining convoy routes and ports around Britain. German submarines also operated in the Mediterranean Sea, in the Caribbean Sea, and along the U.S. coast. Initially, contact mines (requiring a ship to physically strike a mine to detonate it) were employed, usually tethered at the end of a cable just below the surface of the
Haven-class hospital ship Haven-class hospital ship The "Haven" class of hospital ships was built for the United States Navy (USN) during World War II. "Haven"-class ships also served in the Korean War and the Vietnam War. They were among the first ships to be able to receive casualties directly by helicopter and were the first fully air conditioned ships in the USN. The first ship was laid down in July 1943, while the last was launched in August 1944. In that span the United States produced 6 "Haven"-class hospital ships. The class was based upon the Maritime Commission’s Type C4 ship (as C4-S-B2