Located in the city center, right next to Kalimas River, Monumen Kapal Selam or Monkasel commemorates Surabaya's long history as a naval base. This unique monument features the KRI Pasopati 410, a Soviet-made submarine used by Indonesian naval forces during the Battle of Arafura Sea in 1962. Visitors are allowed to walk around different rooms inside the submarine and even try out the periscope.

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