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SCP-489-JP are three fast attack crafts contained by the SCP Foundation, with "S.P.C." written in white on the left side of the bridge, and a picture of what looks like a shark's mouth painted on the end of the body.
SCP-489-JP has a nervous system that seems to be a brain and a highly developed melon body from the lower part of the bridge to the bow, and the melon can emit sound waves that can be used as an acoustic weapon.
When SCP-489-JP reacts to a shark or shark-related objects, it accelerates to collide with it in an try to destroy or kill it. However, since the 1980s, the targets of their attacks have broadened to include giant marine creatures, fishing boats, and submarines, with the exception of sharks.
SCP-489-JP has been reported to appear since the early 1950s, and has been reported as a suspicious ship by the navies of various countries. the foundation has carried out capture operations due to the possibility of contacting other maritime SCP objects, but all of them have ended in failure. The object was later captured off Hahajima, Ogasawara Islands in 19██ by the Japanese branch.
After SCP-489-JP are contained by the foundation, four experiments were conducted on SCP-489-JP for "response to shark". In an first experiment, adult tiger sharks, shortfin mako sharks, scalloped hammerhead sharks, and live sharksuckers were allowed to enter the experimental area in SCP-489-JP-1. As a result, SCP-489-JP-1 attacked all of the invaded sharks except for live sharksuckers. In the second experiment, a life-size great white shark robot was allowed to invade. The robot did not respond for a while after the experiment started, but when the robot was brought closer, it responded and SCP-489-JP-1 attacked into the robot. In the third experiment, a steel plate with a life-size illustration of a megamouth was used, which was put into the experimental area using a crane. SCP-489-JP-2 was placed in the experimental area. As a result, SCP-489-JP-2 attacked and destroyed that steel plate after 4 minutes. In the last experiment, a nylon cloth with the word "鮫" (shark) printed on it was placed 3 meters above the sea. SCP-489-JP-3 was placed in the experimental area. As a result, SCP-489-JP-3 accelerated, then dove and porpoised to penetrate the target at sea. This was the same result for the words meaning "shark" in the other languages.
After that, the Tanegashima investigators found that several encounters by navies and other agencies of various countries had recorded regular clicks, and the clicks constituted sentences in Morse code. The foundation is analyzing about the clicks.