The wreckage of the Endeavour, the storied British ship that 18th-century explorer Captain James Cook sailed through the uncharted South Pacific, may lie a few hundred feet off Rhode Island’s coast in Newport Harbor, researchers said Wednesday. The 105-foot (32-meter) long, three-masted bark, later renamed the Lord Sandwich, had been hired out by the British Royal Navy as a troop transport when it was one of 13 ships deliberately sunk by the British in 1778 in an effort to blockade the harbor.