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 1930s and until the end of World War II, 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 labourers under Japanese wartime mobilisation policies. During this period, many of those conscripted labourers died on the island due to various dangers, including underground accidents, exhaustion, and malnutrition; 137 died by one estimate; about 1300 by another. In 1959, the island's population reached its peak of 5,259, with a population density of 835 people per hectare (83,500 people/km2, 216,264 people per square mile) for the whole island, or 1,391 per hectare (139,100 people/km2) for the residential district. As petroleum replaced coal in Japan in the 1960s, coal mines began shutting down across the country, and Hashima's mines were no exception. Mitsubishi officially closed the mine in January 1974, and the island was cleared of inhabitants on 20 April. Today, its most notable features are the abandoned and still mostly-intact concrete apartment buildings, the surrounding seawall, and its distinctive profile shape. The island has been administered as part of Nagasaki city since the merger with the former town of Takashima in 2005. Travel to Hashima was re-opened on 22 April 2009, after 35 years of closure. Current status 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 23 August 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 meters (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 ageing. It was estimated that landing