Nautilus Reef
About Nautilus Reef
Nautilus Reef is a reef formed from an ancient lava field, located just offshore from Ala Moana Beach on Oahu. It’s described as an easy boat dive with a shallower northwest side near shore that slopes down and drops to deeper water on the south side. The site is known for abundant fish life and urchins, with the chance of seeing a whitetip reef shark resting beneath overhangs.
Where Is Nautilus Reef?
Nautilus Reef Planning Details
Depth range, seasonality, and planning context.
Reported Depth
Up to 30.5m
Depth Note
Shallower on the northwest side closer to shore, dropping to about 100 ft on the south side.
Safety & Access At Nautilus Reef
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Overhangs are present; stay aware of depth changes as the reef drops deeper on the south side.
Local Intel For Nautilus Reef
Community notes to help plan your visit.
Scuba
Depth varies by side, with a shallow northwest area and a drop-off reaching about 100 ft on the south side.
Nautilus Reef Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Nautilus Reef.
Exposure Profile at Nautilus Reef
Directional shelter context for incoming swell.
Recent Logged Visits At Nautilus Reef
1 community dive logs and visit reports for this site.
12/6/2025 at 10:00 PM (Pacific/Honolulu)
Dive Spot Log Averages At Nautilus Reef
Average conditions based on logged dives & visits.
Nautilus Reef Guide - Sources and Updates
Last Updated
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