In April 1864, a Union ship named the Maple Leaf hit a Confederate mine off Mandarin Point.
The explosion killed four soldiers and sunk the ship.
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The ship was moved by the Army Corps of Engineers in 1882, but remains buried under mud in the St. Johns River.
In 1994, it was named a national historic landmark and divers are not allowed to go there.
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Artifacts are on display at the Museum of Science and History.
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