1 region · 1 sites · down to 91 m (299 ft)

Guam

Regions1
Sites1
Max depth91 m (299 ft)

Guam has one famous overhead dive: the Blue Hole off Orote Peninsula, a hole in the reef at 15–18 m that drops as a shaft past 91 m, with a window to the open sea at ~40 m. You dive it by boat from Apra Harbor with a local dive centre, and the dive ends as a drift in the open ocean. Guam also has the US Navy's recompression chamber, according to the Navy the only one in Micronesia that also treats civilians.

Not to be missed

Blue Hole (Guam) →
Down a shaft and out through a window at ~40 m into the blue; by boat from Cabras Marina with a dive centre.

Regions

Mariana Islands (Saipan, Rota, Guam)Three famous overhead dives with daylight, a short flight apart: the collapsed cave of the Grotto on Saipan, 112 steps down and with three openings to the sea, the play of light in Rota Hole (Senhanom Cave) off Rota and the shaft of Guam's Blue Hole, with a window at ~40 m. Guided with local dive operators, in water of 27–29 °C.1 caverns · down to 91 m (299 ft)

Map

Cave

Good to know

Past 40 m (130 ft) you need a special certification according to MDA, and Guam Dive Guide warns that it is very easy to go too deep in the Blue Hole.

Tips for safe and enjoyable diving

The current at the Blue Hole is often strong, especially later in the day: descend along the mooring line and bring a buoy (SMB) for the pickup in open water.

Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training.

News

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Searched automatically, last on 5 Nov 2026.

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