Researchers are set to announce that they believe the famed ship used by the legendary explorer Captain James Cook to sail around the world is submerged somewhere in Rhode Island's Newport Harbor.

The Rhode Island Marine Archaeology Project will announce on Wednesday that it's 80 to 100 percent sure that the remains of the HMS Endeavour - later renamed the Lord Sandwich - is among sunken wrecks off the state's coast.

The group used documents in London to map and then analyze sites where the ship may be found in the harbor.

The Endeavour was used by Captain James Cook to claim Australia for the British. It was one of 13 vessels sunk by British soldiers when Newport was under siege in 1778.