Deep Navigation Colliery now home to many local rugby and football teams. Deep Navigation Colliery Deep Navigation Colliery was a coal mine in South Wales, that operated from 1872 until 1991. Located next to the co-developed village of Treharris in the borough of Merthyr Tydfil, on development it was the deepest coalmine in South Wales Coalfield by some . Producing the highest quality steam coal, it powered both the Cunard passenger steamers RMS "Mauretania" and RMS "Lusitania" in their successful attempts at the Blue Riband prize for the most rapid Atlantic Ocean passage. The mine is also thought to have been one 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