Milwaukee Deep Milwaukee Deep Milwaukee Deep, also known as The Milwaukee Depth, () is the deepest part of the Atlantic Ocean and is part of the Puerto Rico Trench. It has a maximum depth of at least . It is just north of the coast of Puerto Rico at "Punto Palmas Altas" in Manatí. This ocean floor feature is named for the USS "Milwaukee" (CL-5), a U.S. Navy Omaha class cruiser, which discovered the Milwaukee Deep on February 14, 1939 with a reading of . On August 19, 1952, the U.S. Fish and Wildlife vessel "Theodore N. Gill" obtained a reading of
SS Milwaukee the Great Lakes" in 1968. As a result of the loss of the SS "Milwaukee", the Grand Trunk needed a new train ferry. The replacement was the , launched November 25, 1930. The replacement vessel is now a museum ship and National Historic Landmark. In April 1972, the wreck was located in Lake Michigan, seven miles northeast of Milwaukee, Wisconsin, three miles offshore (on a line between Milwaukee and Grand Haven), at , in of water. In March 2006, the History Channel television program "Deep Sea Detectives" premiered an episode entitled "Train Wreck in Lake Michigan", which profiled the loss