Hashima Island is an island off the coast of Nagasaki in southwest Japan. Coal mines operated on Hashima from the 1890s, and at one point in time it was the most densely populated place in the world. At its peak, over 5000 miners lived with their families on an island measuring just over a kilometre long and half as wide, working in mines at depths of up to 660m. When the mine closed there was no reason for anyone to reside here, and in the early 1970s the entire island was abandoned, leaving the structures and contents to rot.