Heian Maru

Heian Maru: a submarine tender and the biggest wreck in Truk, resting on its port side. Torpedoes and sub periscopes remain in the cargo, and the shallow uppermost hull suits recreational divers.

Depth

11–33m

Current

Mild

Diver level

Advanced open water

Entry

Boat

Unique features

  • The largest ship in the lagoon at around 155m, a converted submarine tender, lying on its side
  • Torpedoes and periscopes still visible in and around the holds
  • Upper hull from about 11m; seabed near 33m

Sources & last checked

Checked July 2026

This is a researched draft, not yet human-verified. The seasonality and logistics are drawn from the sources below — confirm specifics (permits, fees, closures) with an operator before you book.

Note on the data: Coordinates are approximate; not surveyed dive-site GPS.