Two Tank Shipwreck and Lava Tube Dives

West Oahu's leeward coast offers some of the island's most spectacular underwater terrain, and this two tank shipwreck and lava tube dives Honolulu adventure showcases exactly why local divers keep coming back. Operating from Waianae Boat Harbor, this 4-hour expedition takes you to two dramatically different dive sites where ancient volcanic formations meet modern artificial reefs.

Your first stop is the famous Mahi Shipwreck (also known as the LCU shipwreck), resting at 60-90 feet. This artificial reef has become a magnet for marine life—everything from colorful tropical fish to impressive pelagic species. The second dive explores the shallower lava tube reefs with a maximum depth of 60 feet, where West Oahu's volcanic origins really come alive. Here, fully formed lava tubes, caverns, trenches, and arches create an underwater wonderland that feels almost alien.

What makes these sites special is how the volcanic mountains run directly to the coastline, creating unique geological formations you won't find elsewhere. The lava tubes serve as natural sanctuaries for the area's "regulars"—Hawaiian green sea turtles, various shark species, rays, moray eels, and octopus. While the shipwreck has evolved into a thriving ecosystem, the volcanic structures offer shelter and feeding grounds that support abundant marine life.

This small-group experience limits groups to just 6 divers (ages 12-99), ensuring personalized attention from your English-speaking guide. All scuba equipment, snacks, and refreshments are included. Meet at the "South Seas 2" boat 15 minutes before departure on the left side of Waianae Boat Harbor near the boat launch ramp.

Bring swimwear, towels, reef-safe sunscreen, and a small bag for personal items. With 48-hour advance cancellation for full refunds, this two tank shipwreck and lava tube dives Honolulu experience offers certified divers an unforgettable glimpse into Oahu's volcanic underwater world.