Katori Maru was a steam ocean liner of the Empire of Japan. She was built in Nagasaki in 1912–13. In the Second World War the Imperial Japanese Navy requisitioned her as a troop ship. In 1941 a Royal Netherlands Navy submarine sank her off the coast of Sarawak. Her wreck was discovered in 2003. It had become an artificial reef and became a scuba diving destination. In 2013 divers removed historic artifacts from the wreck, and in 2016 salvage vessels destroyed most of the wreck for its scrap metal. Today little of the wreck remains except the bow.