Overview
The 911 foot Essex class aircraft carrier nicknamed the Mighty O, scuttled 22.5 nautical miles southeast of Pensacola Pass in May 2006 as the largest vessel ever sunk to form an artificial reef. The island superstructure tops out at 24 m, the navigation bridge sits at 36 m, the flight deck rests at 44 m, and the keel touches sand at 65 m. Amberjack, almaco jack, and barracuda patrol the towers in tornado schools, goliath grouper hold inside the hangar bay openings, and red snapper carpet the catwalks. Manta rays and whale sharks drift across the open deck on warm Gulf Stream eddies in late summer. Encrusted now in sponges, hydroids, and oyster colonies, the wreck is the signature deep tech dive of the Gulf of Mexico.
Briefing note
Recreational divers are limited to the island superstructure at 24 to 40 m on air or nitrox; the flight deck and hangar bay require trimix and full technical certification. The Florida Fish and Wildlife Conservation Commission manages the site as the Oriskany Reef. Surface conditions in the open Gulf can change quickly, so a calm forecast is essential. Penetration is unrestricted but the wreck is enormous and silty inside the hangar deck — reel, redundant lights, and wreck training mandatory. Nearest recompression chamber is in Pensacola.
What you'll see
6 species curated- year-roundGoliath grouper
- year-roundGreater amberjack
- year-roundRed snapper
- year-roundGreat barracuda
- rareWhale sharkPeak: Jul · Aug · Sep
- rareManta rayPeak: Jul · Aug · Sep
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 16–18 °C | 12–25 m | mild |
| Feb | 15–17 °C | 12–25 m | mild |
| Mar | 16–19 °C | 15–25 m | mild |
| Apr | 19–22 °C | 15–30 m | mild |
| May | 22–25 °C | 18–30 m | mild |
| Jun | 26–28 °C | 20–30 m | mild |
| Jul | 28–30 °C | 20–30 m | mild |
| Aug | 29–31 °C | 20–30 m | mild |
| Sep | 27–29 °C | 18–30 m | moderate |
| Oct | 24–27 °C | 15–25 m | mild |
| Nov | 20–23 °C | 12–25 m | mild |
| Dec | 17–19 °C | 12–25 m | mild |
Season calendar
Peak season highlighted · current month outlined
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