ERSTA-batteri Landsort, located on Öja outside Nynäshamn, was built to protect Stockholm from an attack. The construction began as part of the Havsbandslinjen, a chain of artillery batteries started around 1936, to protect Stockholm and eastern areas. However, this chain of batteries was replaced by the ERSTA batteries. ERSTA-batteri Landsort is a member of the latter group, which was in use from 1977 to 2000.
There were five additional similar ERSTA batteries. Since 2018, the battery has been a state building monument. The ERSTA-batteri at Landsort features a gigantic 150-ton Bofors cannon, model 12 cm tornautomatpjäs m/70. It can fire 22-kilogram projectiles, one every two seconds, to targets up to 30 kilometers out at sea.
The soldiers' quarters remain bedded and the technical equipment is entirely of local origin and is roughly 1970s standard but was world-leading technology and was exported. The battery is open to the public as a museum since January 1, 2013, called Batteri Landsort.
Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons
Written by Nik Frost
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