Irako Maru Wreck
Location guideApo Reef

Irako Maru Wreck

2843 madvanced+wrecks● In season now

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Overview

Imperial Japanese Navy food supply and refrigeration ship sunk by US carrier aircraft on 24 September 1944 — Coron's deepest signature wreck. The 147 m hull rests virtually upright between 28 and 43 m, tilted slightly to port and almost fully intact. Penetration runs through the wheelhouse, the engine room with its four large diesels, the galley with stove still in place, and crew bunkrooms reached via a stern hull opening near the rudder at 40 m. Schooling jacks shadow the bow, longfin batfish drift around the mast, and groupers and stingrays settle on silted decks.

Briefing note

Coron's deepest dive and considered the most technically demanding of the WWII wreck circuit. Bottom at 43 m exceeds recreational limits; Nitrox, wreck and deep certifications are typical operator requirements. Penetration of engine room, galley and bunkrooms requires wreck specialty training, redundant lights and a reel. Surface conditions and currents close the wreck during southwest monsoon storms (July to September).

What you'll see

6 species curated
  • Giant trevally
    year-round
  • Longfin batfish
    year-round
  • Grouper
    year-round
  • Green turtle
    seasonal
    Peak: Mar · Apr · May · Nov · Dec
  • Bluespotted stingray
    rare
  • Lionfish
    year-round

Conditions

MonthWaterVisibilityCurrent
Jan2729 °C1525 mmoderate
Feb2729 °C1525 mmoderate
Mar2730 °C2030 mmoderate
Apr2830 °C2030 mmoderate
May2830 °C1525 mmoderate
Jun2829 °C815 mmoderate
Jul2829 °C512 mstrong
Aug2729 °C512 mstrong
Sep2729 °C815 mstrong
Oct2729 °C1020 mmoderate
Nov2729 °C1525 mmoderate
Dec2729 °C1525 mmoderate

Season calendar

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Peak season highlighted · current month outlined

Gear for this site

Beyond the basic kit
  • Primary plus backup dive lightEngine room, galley and stern crew compartment penetrations sit in full darkness, requiring redundant lights.
  • Technical dive computer43 m bottom and multilevel deco profile mean Nitrox planning and conservative gradient factors are standard practice on this wreck.
  • Wreck reel and SMBCoron currents and the long upright hull demand a guideline for penetration and an SMB for blue water ascents.

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