Muck diving

Recreational diving on a loose sedimentary bottom

Muck diving is recreational diving on a loose sedimentary bottom, usually in relatively low visibility. It gets its name from the sediment that lies on the bottom at many dive sites - a frequently muddy or "mucky" environment. Other than muddy sediment, the muck dive substrate may consist of dead coral skeletons, garbage and natural detritus. The visibility is usually less than on the reef or wreck sites of the area. However, the sediment and detritus environment has a different ecology to the reef, and the "muck" substrate can be the habitat for unusual, exotic and juvenile organisms that are not found in the cleaner reef sites of the region.

This keyword could refer to multiple things. Here are some suggestions: