CHIDAI MARU NO 25 - Yap
The Chidai Maru No. 25 isn’t your typical deep Yap wreck. Forget the big swim-throughs and the thermoclines. This Japanese tanker ran aground on Ngulu Atoll, and she now sits right on the surface, her hull and superstructure breaking the water. We love this site for its sheer accessibility, a true snorkel-and-chill wreck dive. You’re exploring a shipwreck that’s practically an island, with the sun streaming through the shallow water illuminating every rivet. We’ve seen small reef sharks patrolling the shadows of the bow, and a kaleidoscope of reef fish darting in and out of the rusted metalwork. Our favourite part? Peeking into the exposed engine room from above, watching the light play on the submerged machinery. This spot is perfect for photographers who want ample natural light, or anyone who enjoys a leisurely drift over history without the need for heavy gear. Just grab your mask and fins, and you’re set for a proper look at a piece of wartime history.
- Location
- Yap, Micronesia, Central & South Pacific
- Coordinates
- 8.350000, 137.475000
- Type
- wreck
- Maximum Depth
- 2m
Best Time to Dive in Yap
The warmest water temperatures in Yap occur in January, averaging 29.0°C. The coolest conditions are in December at 29.0°C.
Monthly Water Temperatures
- January: 29.0°C (air: 27.5°C)
- February: 29.0°C (air: 27.5°C)
- March: 29.0°C (air: 27.5°C)
- April: 29.0°C (air: 27.7°C)
- May: 29.0°C (air: 28.0°C)
- June: 29.0°C (air: 27.6°C)
- July: 29.0°C (air: 27.6°C)
- August: 29.0°C (air: 27.7°C)
- September: 29.0°C (air: 27.9°C)
- October: 29.0°C (air: 27.9°C)
- November: 29.0°C (air: 28.0°C)
- December: 29.0°C (air: 28.0°C)
Nearby Dive Sites in Yap
- 1 2
- Big Bend
- Bird Island
- Choqol Mini Wall - 10-30m (wall)
- CURACO - 10m (wreck)
- Eagle’s Nest - Micronesia - 25m (pinnacle)
- Gabach Channel (drift)
- Gapow Reef (reef)
- HAYABUSA MARU NO.2 - 0m (wreck)
- Kurrekurredutt Dropoff (wall)
- Laura Marie Wreck (wreck)
- Lionfish Wall (wall)
- Magic Kingdom - 21m
- Main Channel (drift)
- Manta Ridge
Nearest Dive Centres to CHIDAI MARU NO 25
Marine Life in Yap
Home to 316 recorded species including 253 reef fish, 20 hard corals, 17 sea cucumbers, 13 sea snails & nudibranchs, 3 clams & mussels, 3 sharks & rays.
Notable Species
- Bristle-toothed Surgeonfish (Ctenochaetus striatus) - Reef Fish
- Blue Parrotfish (Scarus oviceps) - Reef Fish
- Clown Tang (Naso lituratus) - Reef Fish
- Blunt-head Parrotfish (Chlorurus microrhinos) - Reef Fish
- Blackfin Soldierfish (Myripristis adusta) - Reef Fish
- Black sea cucumber (Holothuria atra) - Sea Cucumbers
- Bluefish (Kyphosus vaigiensis) - Reef Fish
- Long-nosed Parrotfish (Hipposcarus longiceps) - Reef Fish
- Sea chub (Kyphosus cinerascens) - Reef Fish
- Threadfin (Chaetodon auriga) - Reef Fish
- Greenfish (Stichopus chloronotus) - Sea Cucumbers
- Maori Wrasse (Cheilinus undulatus) - Reef Fish
- Black-barred Surgeonfish (Acanthurus nigricauda) - Reef Fish
- Bullethead Parrotfish (Chlorurus sordidus) - Reef Fish
- Small giant clam (Tridacna maxima) - Clams & Mussels
- Argus Grouper (Cephalopholis argus) - Reef Fish
- Schlegel's Parrotfish (Scarus schlegeli) - Reef Fish
- Stony coral (Porites cylindrica) - Hard Corals
- Pinkfish (Holothuria edulis) - Sea Cucumbers
- Banded Goatfish (Parupeneus multifasciatus) - Reef Fish
Recommended Packing List for CHIDAI MARU NO 25
Based on average water temperature of 29.0°C.
- Shorty or Rashguard - warm 29°C water needs minimal exposure protection
- Mask - essential for every dive
- Fins
- BCD - buoyancy compensator
- Regulator - your most safety-critical piece of gear
- Dive Computer - tracks depth, time, and NDL
- Surface Marker Buoy (SMB) - essential for boat pickups
- Dive Torch - useful for crevices and colour at depth
- Underwater Camera - capture your diving memories