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Chuuk Lagoon, once Truk, stands as the world's premier wreck diving graveyard from Operation Hailstone in 1944, with over 60 WWII ships sunk in sheltered waters. Technical depths below 40m unlock the deepest holds of icons like San Francisco Maru and Aikoku Maru, revealing untouched cargo, aircraft, and munitions frozen in time. Coral-encrusted relics host thriving reefs, blending history with marine biodiversity unmatched elsewhere.
Top tec sites include San Francisco Maru (37-62m) for its surgical tools and fighters, Aikoku Maru (40-64m) with sake warehouses, and Oite Destroyer (58m) amid torpedo debris. Liveaboards group dives by qualification, pairing tec divers for extended bottom times on rebreathers or trimix. Explore Hoki Maru (30-51m) for trucks and bulldozers in explosive-damaged holds.
Dive December to April for 30-100ft visibility, 82-84°F water, and negligible currents. Prepare for 30-60m depths with Tec 40+, enriched air, and deep/wreck specialties; operators supply gas but verify trimix availability. Arrive via Guam flights, budgeting for liveaboard packages covering 3-4 tec dives daily.
Chuukese locals guide dives with respect for war graves, sharing stories of ancestors aboard the wrecks. Dive shops like Blue Lagoon and Truk Stop foster a tight-knit tec community, where shared deco stops build bonds. Operators enforce no-touch policies to preserve sites as living museums.
Book liveaboards like Thorfinn or Master Liveaboards 6-12 months ahead for tec itineraries, as spots fill fast in dry season. Confirm operator tec facilities, including trimix fills and deco support, before committing. Arrive 2-3 days early to acclimate and handle flight delays from Guam.
Rent tec doubles, stages, and regulators from operators, but bring personal SMBs, backup lights, and wetnotes. Pack 5mm wetsuits for 82-84°F water and rash guards for sun. Stage gear meticulously to avoid entanglement in overhead wreck environments.