Dive-site story
First Cathedrals is one of Hawaii's premier volcanic cavern dives, located along the southern coast of Lanai. The site centers on a massive, two-story underwater lava tube with a perforated ceiling that filters sunlight down through the water column, creating a dramatic stained-glass effect across the cavern chamber. Divers enter through broad swim-throughs to explore the vaulted interior before navigating out through side passages, lava arches, or the surge-driven shot hole.
Light beams filtering through the perforated cavern ceiling resembling cathedral stained glass
Lava tube chamber housing resting whitetip reef sharks and nocturnal invertebrates
Expansive network of outer lava arches, ridges, and boulder fields
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Summer months offer the calmest sea conditions across the Auau Channel, while winter brings rougher crossings alongside humpback whale sightings.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Whitetip Reef SharkTriaenodon obesus | Common | ||||||||||||
| Green Sea TurtleChelonia mydas | Common | ||||||||||||
| Bandit AngelfishApolemichthys arcuatus | Seasonal | ||||||||||||
| Viper MorayEnchelycore pardalis | Rare | ||||||||||||
| Spiny LobsterPanulirus marginatus | Common |
Marine forecast
