Horn Island was one of the most important Allied bases in northern Australia during World War II. Its airfield, built in 1942, supported fighters and bombers operating against Japanese forces in New Guinea and was itself bombed repeatedly by Japanese aircraft – after Darwin, it was one of the most attacked places in Australia. Many of the island's WWII relics are on land: gun emplacements, slit trenches, and aircraft wrecks in the bush, including the wreck of a Beaufort and a DC-3 that can be visited on heritage tours.

Underwater, the remains are fragmentary. Marine Life Network's Torres Strait page describes pieces of a B-17 bomber scattered off the end of the runway in tidal water, with variable visibility and scattered sites that require extended local knowledge; it notes that the main recreational diving activity in the area is crayfishing. The debris lies in shallow, tidal water, where visibility is often poor and currents run with the tide.

Crocodiles are a serious hazard in Torres Strait, and diving here should only be done with local guidance. For divers already visiting Horn Island at the end of a far-northern liveaboard trip, the island's WWII history is best explored on land through the local heritage museum and tours, with the underwater debris as a niche add-on for enthusiasts. For a substantial WWII aircraft wreck dive in the region, the Japanese Zero off Hammond Island (listed separately) is the better-documented site.

The sites are part of Torres Strait Islander land and sea country; seek permission and local guidance before diving.

Fly Cairns–Horn Island (daily Qantaslink/Regional Express services, about 1 hr 45 min); Horn Island airport links to Thursday Island by a 15–20 minute passenger ferry. There is no full-service dive shop in Torres Strait, so diving is arranged either on an expedition liveaboard (Mike Ball's Spoilsport ends or starts its November Northern Exposure trips at Horn Island Pier and has dived the Quetta; PDS's MV Kalinda has also finished trips there) or through local contacts and club divers on Thursday Island with a local boat. Bring all equipment; fills are limited and must be arranged in advance.

Torres Strait is a shallow, tide-dominated passage between the Coral Sea and the Arafura Sea, and the tides drive everything. Currents in channels such as the Adolphus, Prince of Wales and Endeavour channels regularly exceed 4 knots, and sites are only diveable for a short slack-water window – often once a day, and sometimes not at all on big spring tides. Plan around neap tides and consult local tide tables for the exact slack.

The south-east trades blow strongly from about April to November, raising steep wind-against-tide seas; the calmest period is the transition around November–December (when liveaboards visit), and the north-west monsoon season (December–April) brings storms, cyclone risk, stingers and reduced visibility from run-off. Visibility is variable, typically 5–15 m, and is best on the flood tide during neaps.

Only with a local guide on a neap-tide slack: enter from shore or a small boat at the runway end, search the shallow tidal flats for the scattered aircraft pieces in 1–5 m, and exit before the tide turns. Keep a spotter on the surface for crocodiles.

Aircraft debris is protected historic material – do not remove; UCH Act 2018 protects aircraft wrecks over 75 years old.

No dive operator – sites are scattered and require extended local knowledge; arrange through local contacts or the Torres Strait Heritage Museum/tour operators on Horn Island. Main local recreational diving is crayfishing.