USS Spiegel Grove

Measuring a whopping 510 feet long, this former military vessel has become a bona fide reef since its 2002 sinking, with a thick mantle of coral and a healthy population of fish. The ship rests on the sea floor at a depth of 134 feet, with its wheelhouse topping out at 60 feet; this is not a wreck for novice divers. But intrepid souls with the proper training will enjoy the challenge of finning around the massive ship.