Neptune Memorial Reef An Underwater Cemetery

Originally known as the Atlantis Memorial Reef, the Neptune Memorial Reef is an underwater mausoleum for cremated remains. Located 3.25 miles east of Key Biscayne in Miami, Florida, it is also the world's largest man-made reef, covering over 65,000 square-meters of ocean floor, at a depth of 40 feet.
Instead of spreading ashes over ocean waters, people can take the remains of a loved one to Neptune Memorial Reef, where the ashes are mixed with cement designed for underwater use and fitted into a mold, which a diver then places and secures into the reef. A copper and bronze plaque is then installed next to the structure and you are given a photo album with images from the installation.