Uncovering Secrets Beneath the Waves: Sunken Ships in Hawaii

The waters off Hawaii hold more than waves and marine life — they preserve a submerged history of ships that never made it back to port. In 2024, a team from the University of Hawaii’s Undersea Research Laboratory sent the Pisces V submersible drone more than half a kilometer below the surface off Oahu and found something remarkable: the USS Kailua, a ship sunk by torpedo in 1946, with its wheel, mast, and navy number IX-71 still intact.

That discovery is just one chapter in a much larger story. Hawaii’s waters contain dozens of sunken ships spanning the late 19th century through World War II and beyond. Some sit at depths only submersibles can reach. Others lie within diving range off Waikiki. A few are visible from shore. This guide covers the range — from deep-water wrecks to accessible dive sites and shoreline graveyards — so you can decide which ones fit your trip, your skill level, and your curiosity.

Here’s a quick look at the wrecks covered in this guide, so you can match each one to your interests and ability.

USS Kailua: A Deep-Water Time Capsule

The USS Kailua started life in 1923 as the Dickenson, a cable-laying vessel for the Commercial Pacific Cable Company. Its job was to lay and maintain submarine telecommunications cables connecting the US to Midway and Fanning Island in the North Pacific — the backbone of global communication before satellites existed. When World War II erupted, the ship was repurposed, evacuated British telecommunications employees from Midway Island after Pearl Harbor, and survived a submarine encounter before being sunk by torpedo on February 7, 1946, off the coast of Oahu.

Terry Kerby, the submersible pilot who discovered the wreck, described closing in on a large sonar target with the Pisces submersible — a moment that underscores how much of Hawaii’s maritime heritage remains unseen. Researchers plan to create a detailed 3D map of the wreck and there’s discussion of turning the site into a protected marine sanctuary.

WWII Training Wrecks: The Nautilus Expedition

Not all of Hawaii’s wrecks lie in deep water. The E/V Nautilus expedition, funded by National Geographic, mapped nine wrecks off Maui and Lānaʻi using high-resolution 3D photogrammetry. The sites include bizarre-looking amphibious tractors called Amtraks, used to transport troops from sea to shore, and a Helldiver plane that maritime archaeologist Jason Raupp described as the most intact WWII Helldiver he’d seen outside dedicated aviation museums.

The expedition’s reach extended beyond archaeology: educator Ashleigh Glickley reported real-time classroom engagement that inspired students about careers in STEM and history. The project is ongoing, with plans to protect these sites as nonrenewable cultural resources.

Shipwreck Beach: Lānaʻi’s Intentional Graveyard

On the north shore of Lānaʻi, a six-mile stretch of coastline known as Shipwreck Beach holds about two dozen ships intentionally grounded from the 1870s through the 1940s. According to Hans K. Van Tilburg of NOAA, these vessels were deliberately beached as a way to dispose of old ships without creating navigational hazards elsewhere.

The site also connects to Hawaii’s cowboy history: the Paniolo, Hawaiian cowboys, herded cattle onto boats from these very beaches due to the lack of safe landings or harbors, riding them into shallow water and maneuvering them onto vessels with ropes. Researchers continue to survey the shoreline, balancing the value of these sites as archaeological treasures with their role as marine debris that can break down in the ecosystem.

Accessible Dive Wrecks: Oʻahu’s Artificial Reefs

For certified divers, some of Hawaii’s most accessible wrecks sit off Waikīkī. Three sites in particular draw regular visits: the YO-257, the Sea Tiger, and a Vought F4U Corsair plane. Each was sunk or ditched under different circumstances, and each has transformed into an artificial reef hosting vibrant marine life.

All three wrecks have become encrusted with coral and attract green sea turtles (Honu), white-tip reef sharks, spotted eagle rays, and moray eels. The wrecks provide shelter, feeding grounds, and cleaning stations for marine life. Advanced Open Water and Nitrox certifications are recommended for these depths, and winter conditions can be challenging — the leeward sides of islands may offer better diving when northern shores are rough.

Maritime archaeologist Jason Raupp has advocated for installing buoys at these sites to allow public diving with ethical operators, and Hans Van Tilburg has suggested partnering with the Hawaiian Islands Recreational Scuba Association (HIRSA) to install underwater plaques that show respect for the sites. The goal is to ensure these wrecks benefit the public rather than remaining only in academic reports.

Seeing Wrecks Without Scuba Gear

Not everyone dives, and Hawaii’s wrecks don’t require certification to appreciate. Several options let you see sunken ships from the surface or from a submarine.

Snorkelers can access some shallow artificial reefs, though guided tours help locate specific sites. The Carthaginian II was intentionally sunk off Maui in 2005 to serve as an artificial reef and is accessible to snorkelers and divers alike. For families with younger kids or anyone who prefers dry clothes, a submarine tour is the easiest way to see a wreck up close without getting wet.

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If you’re considering a submarine or glass-bottom trip, check current availability through local tour operators — the submarine tours off Waikīkī are a solid option for first-time visitors who want to see the wreck ecosystem without any diving experience.

Diving Safety, Certifications & Preservation

Wreck diving in Hawaii comes with real considerations around depth, currents, and preservation ethics. The table below breaks down the certification requirements for the most popular accessible wrecks.

Certifications and Preparation

Advanced Open Water and Nitrox certifications are recommended for any wreck deeper than 60 ft. Plan your dive in advance, monitor your gauges, and avoid unplanned penetration of wreck interiors — the Sea Tiger’s open cargo holds invite exploration, but silt and tight spaces can turn a fun dive into a dangerous one quickly. Winter swells can make conditions rough; leeward shores (the sides sheltered from prevailing wind) often provide calmer conditions when northern shores are choppy.

Preservation Ethics

These wrecks are nonrenewable cultural resources. The maritime archaeologists who mapped the Maui and Lānaʻi wrecks emphasized that the sites should benefit the public, not just sit in academic reports. That means if you dive them, look but don’t touch — don’t remove artifacts, don’t disturb the marine life, and don’t damage the coral encrustation. Several researchers have proposed installing underwater plaques and partnering with the Hawaiian Islands Recreational Scuba Association to promote ethical access.

Gear for Wreck Diving

If you’re planning to document your dives, a compact action camera like the DJI Osmo Action 6 Bundle handles underwater footage well in the visibility conditions typical around Oʻahu’s wrecks. For divers who want to track depth and bottom time precisely, a dedicated dive computer such as the Garmin Descent Mk3i gives you air integration and multi-gas support — useful if you’re planning multiple wreck dives in a day.

Before You Go — Hawaii’s Sunken Ships

Can I see any shipwrecks without diving?

Yes. Atlantis Submarines tours off Waikīkī descend to about 100 ft and pass the YO-257 wreck. Glass-bottom boat tours also provide surface views of shallow wrecks and reefs. At Pearl Harbor, the USS Arizona and USS Utah memorials let you see submerged battleships from above.

What’s the best wreck for beginner divers?

The YO-257 at roughly 100 ft is the most accessible of the famous wrecks, but you’ll still need Advanced Open Water certification. If you’re not at that level yet, consider a guided reef dive first and work up to wreck depth on a later trip.

Are the wrecks safe to explore?

Wrecks at 100 ft or deeper require careful dive planning — monitor your air, depth, and no-stop limits. The Sea Tiger and Corsair sites are particularly deep. Penetrating wreck interiors without training and a reel is not recommended. Stick to the outside unless you have technical diving experience.

What’s the most historically significant wreck in Hawaii?

The USS Kailua is arguably the most significant recent discovery, given its dual role in telecommunications and WWII service. The USS Arizona at Pearl Harbor remains the most visited and solemn wreck site in the state.

When’s the best time of year for wreck diving in Hawaii?

Winter months (November–March) can bring bigger swells, especially on north-facing shores. Leeward sides of the islands — south and west coasts — tend to be calmer year-round. Summer offers generally flatter seas and better visibility across most sites.

From Deep Water to Shoreline

The USS Kailua sat unknown on the ocean floor for nearly 80 years before a submersible’s sonar picked it up — a reminder that even well-charted waters still hold surprises. Whether you’re watching a submarine glide past the YO-257, spotting YOGN-42 from the beach on Lānaʻi, or scrolling through 3D models of the Nautilus wrecks online, Hawaii’s sunken ships offer a tangible connection to the people who sailed, worked, and fought in these waters. The ships are gone, but their stories are still surfacing.

If you’re planning a multi-island trip to see these sites, our island-hopping guide for Hawaii covers the logistics of getting between Oʻahu, Maui, and Lānaʻi efficiently.

References

LiveScience. “USS Kailua Wreck Discovered Off Hawaii.” ↗

EurekAlert. “Submersible Finds WWII Shipwreck.” ↗

Discover Magazine. “A Hidden Graveyard of 18th-Century Ships Makes Hawaii’s Shipwreck Beach.” ↗

NOAA Office of National Marine Sanctuaries. “Lānaʻi Shipwreck Trail.” ↗

For more on Hawaii’s maritime history and practical trip planning, check out our guide to island-hopping across Hawaii and our deep dive into immersive cultural experiences on Oʻahu — both pair naturally with a wreck-focused itinerary.