Some of the footage I shot last summer of Goliath grouper aggregations using a static, unmanned camera placed at the base of a wreck for 2 hours. You can see a diver begin to enter the frame at 26;20;00 and the obvious effect on the fish. The diver gives a good reference for the size of these fish. The stern wreckage in the center raises about 20ft off the bottom at 120fsw.