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
Wreck of the RMS Titanic . The boilers found by "Argo", which mark the point at which the ship went down, are about east of the stern at . The two main parts of the wreck of "Titanic" present a striking contrast. Although fourteen survivors testified that the ship had broken apart as she sank, this testimony was discounted by the official inquiries, and it was supposed that the ship had sunk intact. It is now clear that the stresses on "Titanic" caused the ship to split apart between the second and third funnels at or just below the surface. The bow section, which measures