Deep Navigation Colliery 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 several locally that provided coal to the RMS Titanic;
Deep ocean minerals are three distinctly different layers of ocean water - Surface Sea Water, Deep Ocean Water (DOW) and Very Deep Ocean Water. Each layer remains separate and autonomous from the others, moving at different speeds and directions from different kinetic forces and having different temperatures, densities and life form status. "The surface sea water layer" is influenced by sunlight penetration and circulates rapidly in unison with the seasons and wind patterns to a depth of 250 meters. It supports micro and animal life. "The middle layer is DOW" where the water is free of sunlight and life forms. It is characterized