Diving atLCU (United States)
Conditions at the LCU wreck in Oahu typically present divers with clear visibility, making the structure of this sunken Landing Craft Utility vessel readily apparent. Resting at an approximate maximum depth of 27 m (90 ft), the site generally experiences calm to moderate oceanic influences. Divers often find consistent water movement, which dictates how the dive unfolds. Expect comfortable air temperatures year-round, contributing to a pleasant experience both on and off the boat.
As evening covers LCU, the local air temperature is measured at 27.5°C. The current wave height at the surface is recorded at 0.98m. These late-day readings characterize the surface conditions for the night.
Dive Site Coordinates
21.4207, -158.1934
Key Dive Site Facts
Dive Site Overview
This dive site centers around a Landing Craft Utility (LCU) boat, a type of vessel historically employed by the US Navy for transporting troops and equipment during amphibious landings. The LCU was intentionally scuttled in 1998, becoming a vital component of the State of Hawaii’s artificial reef program.
It now lies upside down in approximately 27 m (90 ft) of water, creating an intriguing structure for certified divers to explore. The wreck is settled on a flat rubble plain, surrounded by scattered 'Z' blocks that add to the reef's complexity. Divers can navigate beneath sections of the inverted hull, which provides natural overhead environments and swim-through opportunities.
This site is particularly engaging for wreck enthusiasts, offering both external appreciation of the craft's design and limited penetration for those with appropriate training and experience. The LCU represents one of three such vessels donated by the Pearl Harbor Naval Shipyard for this environmental initiative, contributing significantly to local marine habitat.
Best Time to Dive
For an optimal diving experience, consider visiting the LCU wreck between April and October. This period generally brings the 'Good' dive score ratings, primarily due to more favorable sea states. While air temperatures remain comfortably warm throughout the year, ranging from approximately 22°C (72°F) in winter months to 26-27°C (79-81°F) in summer, conditions for surface intervals are most pleasant during these warmer periods. Wave heights tend to be lower from June through September, averaging around 1.07-1.18 m (3.5-3.9 ft), which means smoother boat rides and easier entries and exits. Rainfall is also minimal during these months, ensuring consistently clear skies. Conversely, the period from November to March is marked by 'Moderate' dive scores and higher average wave heights, sometimes exceeding 2 m (6.5 ft), which can lead to less comfortable boat trips and potentially reduced visibility.
Climate Historical Averages
Monthly records compiled from satellite and marine observation nodes over the last 3 years. Data provided by Open-Meteo and MET Norway.
Dive Experience & Conditions
Approaching the LCU wreck, divers descend into saltwater, where the structure gradually materializes from the blue. Water temperatures here are not consistently reported, but generally remain warm, often allowing for longer bottom times in comfortable conditions. During a February 2024 review, visibility was noted at 21-24 m (70-80 ft), though this can vary depending on recent weather and local currents. The site's primary feature, the LCU itself, lies inverted, creating ample overhead space and accessible swim-throughs for those equipped and trained for such exploration. A flat rubble plain surrounds the vessel, punctuated by 'Z' blocks that provide additional habitat. Current can range from mild to moderate, influencing the drift over the wreck and the effort required for navigation, so monitoring local conditions is essential.
Dive Difficulty & Safety Guidelines
Diving the LCU wreck requires an advanced certification due to its depth, reaching approximately 27 m (90 ft). Divers planning to explore the wreck's interior or engage in swim-throughs should possess specific wreck diving training and adhere strictly to accepted penetration protocols. The wreck's inverted position means overhead environments are present, necessitating careful planning and appropriate equipment. Always dive within your training and comfort limits. Maintain proper buoyancy control to avoid disturbing the wreck or stirring up sediment, which could reduce visibility for yourself and others. It's also prudent to monitor bottom time carefully at this depth to manage nitrogen absorption. Consult with local dive operators regarding current conditions, including visibility and potential currents, before each dive.
Recommended Equipment
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Verified equipment recommendations for this dive site are being reviewed and may be added as additional source checks are completed.
Recommended Dive Suit
Individual comfort in the water can vary significantly from diver to diver, even under the same conditions.
For most recreational dives, 3mm wetsuit should provide comfortable protection. Consider warmer surface protection (like a boat coat) due to brisk winds. Surface temperatures may decrease slightly later in the week. A significant temperature drop is forecast; strongly suggest bringing a backup warmer suit option. Carrying a secondary suit is common practice among experienced divers.
Divers heading to LCU today should expect water temperatures around 26°C (78°F). Surface air temperatures are resting at 28°C (82°F).
Conditions last reviewed: 18:00 using the latest environmental data.
Dive Logistics & Preparation
Hyperbaric Chamber
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Entry Requirements
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Currency
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Marine Life at LCU
Encounters at the LCU wreck often include sightings of various pelagic and reef creatures, adapting to the artificial reef habitat. Divers might spot different species of sharks patrolling the perimeter or resting near the wreck. Turtles are also common visitors, often grazing on nearby growth or simply passing through the area. Occasionally, depending on the season, divers could be fortunate enough to observe dolphins or even whales in the wider vicinity of the dive site. Many smaller reef fish find shelter within the wreck's nooks and crannies, adding a dynamic element to the dive.
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Frequently Asked Questions
What type of dive is the LCU wreck?
This is primarily a boat-accessed wreck dive. The site focuses on a scuttled Landing Craft Utility vessel, offering both external exploration and opportunities for limited swim-throughs beneath the inverted hull.
What is the maximum depth of the LCU wreck?
The LCU wreck rests at an approximate maximum depth of 27 m (90 ft). This depth categorizes it as a deep dive, requiring appropriate training and experience.
Can beginners dive the LCU wreck?
Due to its depth and the presence of overhead environments, the LCU wreck is recommended for certified advanced divers or those with specific wreck diving training. It's not typically suitable for beginner divers.
What is the LCU's history?
The LCU was a US Navy Landing Craft Utility boat, used for amphibious operations. It was intentionally scuttled in 1998 as part of the State of Hawaii’s artificial reef program, now serving as a marine habitat.
Is there a current at the LCU wreck?
Currents at the LCU wreck can vary from mild to moderate. Divers should always check with local operators for prevailing conditions on the day of their dive to plan accordingly.
What kind of marine life might I see?
Common sightings include various shark species, turtles, and numerous reef fish. Depending on the season and luck, dolphins or whales might also be observed in the area.
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