Just north of The Quarry is the USS Boston, an American liberty ship, which was converted for mine sweeping duties. The Boston struck the exposed rocky outcrop and sank to the bottom of a coral drop off in 30 meters of water. The wreck is about 70 meters long by 25 meters wide and apart from the two bronze screws is virtually intact. It has been described, by some travel writers, as one of the best dives in the world.

The prevailing longshore current here, at The Quarry, travels north. As the wreck is oriented with the bow pointed towards the north, it is a very relaxing procedure to start at the stern and drift through and around the wreck, to the bow. You ascend the reef wall by clasping the hard corals that cover it to the decompression zone, where many of the animal and plant attractions of The Quarry are also to be found, making it quite an interesting decompression stop.

On either side of the Boston project the long powerful booms which once swept the harbour of New Guinea's northern coastline hunting for mines. Amazing feats of acrobatics are possible if you sit on the booms and wrap your legs around them while the current tries to pull you with it. There are many large "pelagic" inhabiting the holds and superstructure of the ship, including sweet Lips, Jacks, Spotted Cod and Barracuda.

The holds are filled with crates, some intact - others broken open and spilling open their contents upon the decks. The contents of the open crates are quite unusual for a minesweeper - typewriters, wine bottles, crockery and machine parts.