The San Pedro, a member of the 1733 Spanish treasure fleet caught by a hurricane in the Straits of Florida, sank in 18 feet of water one mile south of Indian Key. She is the oldest shipwreck on the Shipwreck Trail with the mystique of a Spanish treasure shipwreck to draw divers and snorkelers alike.

The famous Isaac Allerton, a three-masted schooner, was a part of the fleet that carried the first Pilgrims to America in 1620. The Isaac Allerton was used as a cargo-carrying vessel and sank in 1856 in the shallow waters of the Keys.

The Adelaide Baker In 20 feet of water, four miles south-southeast of Duck Key, lie the remains of a three-masted iron-rigged and reinforced wooden-hull bark. The major features of this ship, locally known as the Conrad and believed to be the Adelaide Baker, are scattered over a square quarter-mile area.