Recreational diving is not recommended at Cordell Bank for a number of reasons. The upper reef areas on Cordell Bank are between 115 and 140 feet and Cordell Bank typically has strong currents that are extremely variable and can run in opposite directions at different depths.
Sea conditions 20 miles from shore can change rapidly, even on days that start calmly. Fog and wind can develop quickly making dive conditions treacherous. Visibility is variable from good to green and ocean temperatures usually hover around 50 degrees farenheit.
In order to protect the fragile reef community, anchoring is prohibited in areas shallower than 300 feet. A sanctuary permit can be issued for research or education purposes.