{"data":{"id":"us/33-cfr-147.843","jurisdiction":"us","citation":"33 CFR 147.843","heading":"Thunder Horse Semi-Submersible safety zone.","body":"(a) Description. Thunder Horse Semi-Submersible, Mississippi Canyon 778 (MC 778), located at position 28°11′26″ N, 88°29′44″ W. The area within 500 meters (1640.4 feet) from each point on the structure's outer edge is a safety zone. These coordinates are based upon [NAD 83].\n(b) Regulation. No vessel may enter or remain in this safety zone except the following:\n(1) An attending vessel;\n(2) A vessel under 100 feet in length overall not engaged in towing; or\n(3) A vessel authorized by the Commander, USCG Heartland District.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER N—OUTER CONTINENTAL SHELF ACTIVITIES","PART 147—SAFETY ZONES"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"dd0ad3731ca310d2ec090ca65031c37b96600d3ac500f836a533f0f58d613acf","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-147.841","next":"us/33-cfr-147.845"},"notice":"GroundRules: Original legal text. Not legal advice."}