Muskö naval base

Muskö Naval Base (Musköbasen) is a Swedish Navy underground naval facility on the island of Muskö just south of Stockholm in Haninge Municipality. The construction of the base started in 1950 and was completed 19 years later in 1969. During the construction about 1.5 million tons of rock were removed. It has 3 docks, originally designed for destroyers and submarines. The underground base itself has an area of several km² and is connected by 20 km (12 mi) of underground roads. In order to connect the base to the mainland, the Muskö road was built at the same time as the base. This crosses several bridges and intermediate islands before finally accessing the island of Muskö through the Muskö Tunnel, a 3 km (1.9 mi) long road tunnel running some 70 metres (230 ft) under the sea. During the Cold War the underground facility was kept highly secret and not much information about it was known to the public. In 2004 the Swedish government decided that the navy should be concentrated to two bases only, the Karlskrona Naval Base and the Berga Naval Base, and much of the Muskö base was closed. However some parts of the facility were still used by the military. The underground shipyards were being operated under contract by Kockums AB and Muskövarvet AB. In the autumn of 2019, as part of an upgrade of defence facilities and manpower, the naval base was revived, and it was announce

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