The waters around Coron and the Calamian Islands hold around a dozen wrecks of Japanese supply and warships sunk in a single American air raid in September 1944. Most lie in 15–40 metres of water, with several accessible to advanced open-water divers and a few — like the Lusong Gunboat — shallow enough to be snorkelled.
Star sites include the Irako (a refrigerated supply ship, 28–43m), the Akitsushima (a seaplane tender, 25–38m), the Olympia Maru (a freighter, 15–25m, the most penetrable of the group) and the Okikawa Maru (a tanker, 16–26m). Several Coron dive operators are reputable; the underwater visibility is often around 15 metres but can collapse to half that in poor conditions.