San Francisco Maru

Verified2026-09-24 checkedWreck

Three light tanks still standing on the foredeck at 48 m, on a wreck whose shallowest deck is deeper than most divers go.

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Depth: 42–63 m138–207 ft
Difficulty: Technical
Entry: Boat · Liveaboard
Typical current: Light
Coordinates: 7°21.618′N 151°49.416′E
Activities: Scuba · Technical

Known as the Million Dollar Wreck for the cargo she went down with. The deck sits at about 48 m and the bottom at 63, so this is a decompression dive on every plan and a trimix dive on most of them. The three Type 95 tanks lashed to the foredeck are the photograph people cross the Pacific for; below them the holds hold trucks, aircraft engines, mines and fuel drums. Bottom time is short, narcosis is real at the depth the tanks sit, and divers have died here. Nothing about this is a first Chuuk dive, and no operator should sell it as one.

Fly to Chuuk (Weno) via Guam. Technical operators and liveaboards run it; most recreational day boats will not.

Best season

ExcellentDec–Mar
GoodApr–Jun
GoodSep–Nov
FairJul–Aug

Before you get in

Going inside a wreck is an overhead environment: silt can take the visibility in seconds, and there is entanglement. Swimming the outside of it is a different dive.
Deeper than recreational limits. It carries a decompression obligation and gas planning, and is not a dive to plan without that training.

Taken from this site’s recorded depth, type and current, and nothing else. An empty list is not a safe site — the sea on the day, the local geography and the boat traffic are not in it. The briefing on the spot comes first.

Conditions

Water temperature: 29°C84°F
Wave height: 0.7 m2 ft
Air temperature: 27.1°C81°F
Wind speed: 18.5 km/h11.5 mph

Updated 2026-10-07 16:15 UTC · Source: Open-Meteo

Weather data by Open-Meteo.com (CC BY 4.0)

Conditions are reported for information only. Assess the site yourself and follow your guide and your training.

No live conditions for this site yet.

We only show numbers we can attribute to a source.

Sea state and tide

On a date

Tide · 10/8

Low07:200.13 m
High13:450.55 m
Low19:150.30 m

Forecast heights against mean sea level. Real tides in a bay, a harbour or over a flat can differ — check an official tide table before you get in.

Pick a day to see its tide

Only wave height and wind are scored, because those are what close a boat ramp or a shore entry. Water temperature is reported and never scored: 12°C is an ordinary dive in a drysuit and punishing in a 3 mm, and a number that cannot see your suit has no business marking it down. Stars do not decide whether you get in — you and your guide do, on the day.

Weather data by Open-Meteo.com (CC BY 4.0)

Marine life you may see

Soft coralDendronephthya spp.Common
NudibranchNudibranchiaSeasonal
Teira batfishPlatax teiraRare
Staghorn coralAcropora spp.Common
FlatwormPseudoceros spp.Rare
Feather starCrinoideaCommon
Blue sea starLinckia laevigataCommon

From divers

What people who were in the water reported. Not a forecast, and not a judgement about whether the site is safe to dive.

No recent reports from divers. If you dived here in the last two weeks, you can say how it was.

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