33 CFR §147.851

1. (a)Description. The Jack St. Malo Semi-Sub facility is in the deepwater area of the Gulf of America at Walker Ridge block 718. The facility is located at 26°14′5.94″ N, 91°15′39.99″ W and the area within 500 meters (1640.4 feet) from each point on the facility structure's outer edge is a safety zone.
2. (b)Regulation. No vessel may enter or remain in this safety zone except the following:
   1. (1)An attending vessel;
   2. (2)A vessel under 100 feet in length overall not engaged in towing; or
   3. (3)A vessel authorized by the Commander, USCG Heartland District or a designated representative.