A fleet of WWII shipwrecks lies scattered across the floor of Darwin Harbour, sunk during the devastating Japanese air raids of 19 February 1942 — the largest single attack on Australian soil. The three wrecks most frequently dived together are the USAT Meigs (a 12,500-ton US Army transport sitting upright at 28 m, the largest casualty of the raid), the SS Mauna Loa (a US merchant cargo ship at 18–22 m, hit during the first wave), and the Song Saigon (a Vietnamese refugee vessel scuttled later). These wrecks form a world-class underwater museum, encrusted with soft corals, sponges, and gorgonians, and are accessed only by boat with tight slack-water windows due to Darwin's massive 8-metre tidal range. Visibility ranges 3–12 m; water temperature 23–30°C. All wrecks are protected under the Historic Shipwrecks Act 1976.
Darwin Harbour wrecks (SS Meigs, Song Saigon, Mauna Loa)
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DANGER: Explicit Risks Present
Darwin Harbour wrecks (SS Meigs, Song Saigon, Mauna Loa) has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Saltwater crocodiles danger
Saltwater crocodiles inhabit Darwin Harbour year-round. Surface support and constant vigilance are required.
- Saltwater crocodile risk danger
Saltwater crocodiles (Crocodylus porosus) inhabit Darwin Harbour year-round. Surface support and constant vigilance are essential.
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High risk: Saltwater crocodiles
Saltwater crocodiles inhabit Darwin Harbour year-round. Surface support and constant vigilance are required.
High risk: Saltwater crocodile risk
Saltwater crocodiles (Crocodylus porosus) inhabit Darwin Harbour year-round. Surface support and constant vigilance are essential.
Moderate risk: Strong tidal currents
Tidal range exceeds 8 metres, generating strong currents outside brief slack-water windows (30–60 min). Dives are tide-dependent and must be meticulously planned.
Moderate risk: Box jellyfish (Oct–May)
Box jellyfish (Chironex fleckeri) are present in Darwin Harbour waters from October through May.
Moderate risk: Box jellyfish (stinger season)
Box jellyfish (Chironex fleckeri) are present in tropical waters of the Top End from October through May. Stings can be life-threatening.
Moderate risk: Deep water (18-28 m)
Water depth ranges from 18-28 m. Wreck penetration requires advanced certification. Decompression obligations must be managed carefully.
Low risk: Variable / low visibility
Visibility ranges 3–12 m typically, dropping sharply on outgoing tide and after wet-season runoff (November–April).
Low risk: War grave restrictions on some sites
Some wrecks (e.g. USS Peary) are designated war graves with strict no-dive restrictions. USAT Meigs, Mauna Loa, and Song Saigon are dive-able but require advanced certification.
Low risk: Variable/poor visibility
Visibility can drop to 2–3m depending on tide, weather, and wet-season runoff. Typically 3–12m.
Low risk: Protected heritage sites
All wrecks are protected under the Historic Shipwrecks Act 1976; some are war graves. Removing artefacts or interfering with structure is illegal.
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Getting in
Boat access only from Cullen Bay Marina, Darwin. Outer harbour wrecks (Meigs, Mauna Loa, Song Saigon) are a 30-40 minute transit from the marina. Several charter operators in Darwin run dive trips to the wrecks, including Dive Darwin and Sea Darwin. All sites are within Darwin Harbour, NT.
Parking available at Cullen Bay Marina carpark (paid parking, limited spaces). Street parking may also be available nearby in Darwin city centre. Some operators offer pickup from Darwin accommodation.
Dive charter fees vary by operator — typically $150-$250 per person for a 2-tank trip including gear. No entry fee to the harbour itself.
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.