Reef Explorers
Superstructure of the Rio de Janeiro Maru wreck, Chuuk
Advanced≤30 m

Rio de Janeiro Maru

Dive site in Chuuk (Truk) Lagoon, Micronesia

Max depth
35 m
Level
Advanced
Best months
Oct–Apr
Current
Mild

Photo: Motoki Kurabayashi, CC BY-SA 4.0, via Wikimedia Commons

The story

Built in 1929 at Mitsubishi in Nagasaki for routes between Japan and South America, the Rio de Janeiro Maru became a submarine tender in 1941. Hit by multiple 1000 lb bombs east of Uman Island, she sank at 0030 on 18 February 1944.

Source: masterliveaboards.com

The dive

A wreck dive.

Who it's for

Recommended minimum: Advanced (PADI Advanced Open Water, N2).

  • DepthThe usual dive goes deeper than lower certifications allow.
  • The site goes deeper than 30 m: Advanced divers stay above 30 m.

Conditions

Dive type
Wreck
Environment
Open water
Water
Sea water

Season in Chuuk (Truk) Lagoon

  • Best
  • Good
  • Possible
  • Closed
  • Not documented yet

Best months: Oct–Apr.

Source: zubludiving.com

Where is Chuuk (Truk) Lagoon?

View on OpenStreetMapLocation: Chuuk Lagoon (Wikipedia)Map: Natural Earth

The point shows the Chuuk (Truk) Lagoon area, not the exact dive site.

About this page

Values marked “Estimated” come from our original catalogue and are being checked against published sources one by one. Sourced values link to where they come from. Conditions change with the season, the weather and the tide: confirm with a local dive centre before you dive.

Find destinations that match your level and dates

Photo credits