Hashima Island, Nagasaki, Japan

Hashima Island, commonly called Gunkanjima (軍艦島; meaning Battleship Island), is an abandoned island lying about 15 kilometers (9 miles) from the city of Nagasaki, in southern Japan. It is one of 505 uninhabited islands in Nagasaki Prefecture. The island's most notable features are its abandoned concrete buildings, undisturbed except by nature, and the surrounding sea wall. While the island is a symbol of the rapid industrialization of Japan, it is also a reminder of its history as a site of forced labor prior to and during the Second World War.

The 6.3-hectare (16-acre) island was known for its undersea coal mines, established in 1887, which operated during the industrialization of Japan. The island reached a peak population of 5,259 in 1959. In 1974, with the coal reserves nearing depletion, the mine was closed and all of the residents departed soon after, leaving the island effectively abandoned for the following three decades. Interest in the island re-emerged in the 2000s on account of its undisturbed historic ruins, and it gradually became a tourist attraction.

In 1916 the company built Japan's first large reinforced concrete building (a 7 floor miner's apartment block), to accommodate their burgeoning ranks of workers. Concrete was specifically used to protect against typhoon destruction. Over the next 55 years, more buildings were constructed, including apartment blocks, a school, kindergarten, hospital, town hall, and a community centre. For entertainment, a clubhouse, cinema, communal bath, swimming pool, rooftop gardens, shops, and a pachinko parlour were built for the miners and their families.

Beginning in the 1930s and until the end of the Second World War, conscripted Korean civilians and Chinese prisoners of war were forced to work under very harsh conditions and brutal treatment at the Mitsubishi facility as forced laborers under Japanese wartime mobilization policies. During this period, it is estimated that about 1,300 of those conscripted laborers died on the island due to various dangers, including underground accidents, exhaustion, and malnutrition.

The island was owned by Mitsubishi until 2002, when it was voluntarily transferred to Takashima Town. Currently, Nagasaki City, which absorbed Takashima Town in 2005, exercises jurisdiction over the island. On August 23, 2005, landing was permitted by the city hall to journalists only. At the time, Nagasaki City planned the restoration of a pier for tourist landings in April 2008. In addition a visitor walkway 220 metres (722 feet) in length was planned, and entry to unsafe building areas was to be prohibited. Due to the delay in development construction, however, at the end of 2007 the city announced that public access was delayed until spring 2009. Additionally the city encountered safety concerns, arising from the risk of collapse of the buildings on the island due to significant aging.