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Dive Spot Guide•
1St Cathedral
First Cathedral is a dramatic boat-access lava-tube dive.
Scuba DivingBoatIntermediate
CaveReef
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Boat access, overhead passages, and a surge-sensitive exit make this a planned cavern dive rather than an easy shore swim.
About 1St Cathedral
First Cathedral is a dramatic Lanai lava-tube dive with skylights, side chambers, and a sculptural cavern route that rewards careful buoyancy and good route discipline. It is best treated as a boat-access overhead dive, with the entry, archway, and back exit all shaping how the dive flows. The site pairs strong visual structure with reef life outside the cavern, so it suits divers who want a memorable guided boat dive rather than an easy shore swim.
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Research Estimate At 1St Cathedral
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 25m
AccessChallenging entry effort
CoralHealthy coral
Aquatic LifeExceptional variety
FacilitiesBasic facilities
Crowd / PopularityVery crowded
CurrentLight current
SurgeModerate surge
Where Is 1St Cathedral?
This spotNearby spots
Community sourced coordinates.
1St Cathedral Planning Details
Depth range, seasonality, and planning context.
Reported Depth
8m - 15m
Depth Note
Public references place the cavern around 25 ft at the top and about 50 ft at the bottom of the archway, with some guides quoting a 45-60 ft range.
Best Season
Year-round, with calmer summer seas usually easiest and winter crossings often paired with whale sightings on the boat ride.
Typical Conditions
Large lava tube with skylights, a central altar rock, side chambers, and a coral garden outside the cavern.
Safety & Access At 1St Cathedral
Hazards, restrictions, and access requirements.
Key Hazards
Boat trafficOverhead environmentSurge
Safety Notes
Do not treat the site like an open reef. Stay within overhead-environment limits, watch surge on the back exit, and keep a disciplined buoyancy profile through the tube.
Access Restrictions
Boat access only; use a charter or guide that knows the cavern route and timing for the surge-sensitive exit.
Legal Notes
Treat the site as a guided Lanai boat dive and follow captain briefings for entry, exit, and route timing.
Local Intel For 1St Cathedral
Community notes to help plan your visit.
Scuba Diving
The classic route is a guided boat dive into a large lava tube with skylights, a central altar feature, and a back exit through the shotgun.
Freediving
Not a freedive-first site. The overhead layout and surge-sensitive exit make it a scuba-first cavern dive.
Snorkeling
Not a snorkel site. The experience depends on the full submerged cavern route and guide-managed timing.
1St Cathedral Dive Conditions Planner
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Visibility Outlook
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Exposure Profile at 1St Cathedral
Directional shelter context for incoming swell.
Exposure Note
Hourly forecast data is not available yet.
Wildlife at 1St Cathedral
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At 1St Cathedral
Community dive logs and visit reports for this site.
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Dive Spot Log Averages At 1St Cathedral
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility25m
Activity
No dive activity logged yet.
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1St Cathedral Guide - Frequently Asked Questions
Planning answers for access, conditions, timing, and site logistics.
1St Cathedral Guide - Sources and Updates
Last Updated
Research Sources
www.gohawaii.com · Official
Official tourism page describing the Lanai Cathedrals and boat-access dive context.
www.scubadiving.com · Dive Article
Magazine write-up with depth, cavern layout, and surge-sensitive exit details.
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