Grave’s Lighthouse is a great dive site with lots of color and large rocks/boulders to explore. Striped bass sightings are common during the summer months. Depths range from 10′ to about 70′. The slowly sloping bottom stops about 70′,and turns to a sandy, gravel-type bottom. Much like Cathedral Rocks on Cape Ann, Grave’s is one of the best dive sites in Boston Harbor!Bookmark the permalink.