Tuna wreck - Similan Islands

The Tuna wreck, off Ko Bon, isn’t actually a tuna boat at all. It’s a fishing trawler, sunk intentionally as an artificial reef back in 2000, and we’ve spent many a no-decompression limit exploring its nooks. She sits upright on a sandy bottom at about 30 metres, offering a decent penetration for those with the right training. We love dropping down to the wheelhouse first, watching the resident lionfish glide through the windows, their venomous spines fanning out. Currents here can pick up, so we always check the tide charts. Dive it on a slack tide, and you’ll have time to really appreciate the details – the huge moray eels that peer out from the engine room, the schools of yellow snapper that shimmer like a living curtain across the deck. Our favourite spot is the stern, where a massive school of fusiliers often hangs, so thick they almost block the light. It’s a proper wreck dive, moody and teeming with life, a great spot for experienced divers looking for something beyond the coral bommies of the Similans.

Location
Similan Islands, Thailand, Southeast Asia
Coordinates
8.566750, 97.646450
Type
wreck

Marine Protected Area: Mu Ko Similan

Best Time to Dive in Similan Islands

The warmest water temperatures in Similan Islands occur in May, averaging 30.8°C. The coolest conditions are in January at 28.6°C.

Monthly Water Temperatures

  • January: 28.6°C
  • February: 29.0°C
  • March: 29.6°C
  • April: 30.6°C
  • May: 30.8°C
  • June: 29.9°C
  • July: 29.6°C
  • August: 29.3°C
  • September: 29.0°C
  • October: 29.0°C
  • November: 29.2°C
  • December: 28.7°C

Nearby Dive Sites in Similan Islands

Nearest Dive Centres to Tuna wreck

Marine Life in Similan Islands

Home to 183 recorded species including 127 reef fish, 38 hard corals, 9 seagrass & algae, 4 sharks & rays, 2 other, 1 octopus & squid.

Notable Species

Recommended Packing List for Tuna wreck

Based on average water temperature of 29.4°C, currents 7 cm/s.

  • 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