
Irako Maru Wreck
Apo Reef · Philippines
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.
Conditions
Depth
28 to 43 m
Advanced depths
Current
Often strong
Can pick up on the edge
Visibility
5 to 12 m
Clearest in the calm season
Water
27 to 30°C
Tropical wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 |
| Vis (m) | 15 | 15 | 20 | 20 | 15 | 8 | 5 | 5 | 8 | 10 | 15 | 15 |
| Current | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Strong | Strong | Strong | Moderate | Moderate | Moderate |
Your chances of seeing each animal
Giant trevally
Last confirmed Apr 1, 2026 · 1 records
Likely
About 6 in 10 dives
Longfin batfish
Last confirmed Apr 1, 2026 · 3 records
Likely
About 6 in 10 dives
Lionfish
Last confirmed Apr 1, 2026 · 4 records
Likely
About 6 in 10 dives
Green turtle
Last confirmed Jul 7, 2026 · 2 records
Sometimes
About 1 in 3 dives
Grouper
Expected
Known here, not yet in recent logs
Bluespotted stingray
Expected
Known here, not yet in recent logs
Gear
Basic kit
For this site
- Primary plus backup dive light · Engine room, galley and stern crew compartment penetrations sit in full darkness, requiring redundant lights.↗
- Technical dive computer · 43 m bottom and multilevel deco profile mean Nitrox planning and conservative gradient factors are standard practice on this wreck.↗
- Wreck reel and SMB · Coron currents and the long upright hull demand a guideline for penetration and an SMB for blue water ascents.