Haian Maru
Why dive here
With 195+ marine species recorded in the area - including barracuda, blacktip reef sharks, eagle rays, grey reef sharks and whitetip reef sharks - Haian Maru offers some of Chuuk (Truk) Lagoon's richest wreck diving. Water ranges 29-30°C, warmest August, October, November.
The Haian Maru feels like stepping into a ghost story. We love this wreck because it’s surprisingly intact, sitting upright, and so accessible. You can slip into the holds and find heaps of sake bottles, still in their wooden crates, a real eerie glimpse into the past. Down in the engine room, shafts of light pierce through, illuminating schools of glassfish that shimmer around the machinery. Our favourite part has to be the stern, where the prop is still in place and big schools of unicornfish often mill about. We’d suggest going early in the morning, before other boats stir up the sediment, for the best visibility inside. It’s a site that really makes you slow down, absorbing the history and the way the reef has completely reclaimed the ship. You’ll find plenty of black sea cucumbers draped across the decks, and we’ve seen some huge parrotfish grazing on the coral growth.
Safety Notes
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
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Conditions
Ocean conditions, forecast and tides for Haian Maru
Haian Maru Ocean Conditions
Monthly averages for Haian Maru, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (7.41, 151.84) (2km away)
October Averages
Sea Temperature
30°C
86°F · Range: 29.3–31.4°C
Air Temperature
28°C
82°F
Wind Speed
6.4 m/s
12.4 knots
Atmospheric Pressure
1009.4 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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