Wreck dive

A dive on a sunken ship, aircraft, or structure, from swimming the outside to trained penetration; the SS Thistlegorm is the classic example.

A wreck dive explores a sunken ship, aircraft, or other man-made structure, whether it went down in war, storm, or accident, or was cleaned and scuttled deliberately as an artificial reef. Wrecks combine history, atmosphere, and rich biology in one site: within a few years, a hull becomes a reef in its own right, packed with schooling fish, corals, and resident predators.

Wreck diving has three levels, and the distinction is critical. Swimming around the outside is open to any certified diver. Passing through the light zone, doorways and open holds with the exit visible, is covered by wreck specialty training. Full penetration into interior spaces beyond the light requires technical wreck training, guidelines, and redundant gas, because silt-out, entanglement in cables, and lost exits kill unprepared divers. Sharp, rusted metal argues for gloves and good trim everywhere on a wreck.

The reference wreck is the SS Thistlegorm in the Egyptian Red Sea, a British freighter sunk in 1941 with motorcycles, trucks, and locomotives still aboard, resting around 30 m. Chuuk Lagoon's WWII fleet and coastal classics like the Zenobia in Cyprus fill dive logs, and wreck names and penetration notes make some of the best logbook entries in diving. Check local rules too, many war wrecks are protected graves where artifacts must never be disturbed.