Blue Hole (Guam)
A natural limestone shaft in the reef off Orote Point, about 300 ft (90 m) deep, with a mooring and a shallow rim near 12 m. Divers drop through the shaft to a large window onto the outer wall at about 38 m (125 ft) and exit there; deeper exploration to about 55 m is technical only. Visibility often exceeds 30 m, and eagle rays, dolphins and the occasional whale shark are seen. Boat access only.
Tiefe: 12–38 m