HMS DIOMEDE - Trincomalee & East Coast

The HMS Diomede is a classic Trinco dive, one we always return to. She went down in 1795 after striking an uncharted rock near Pigeon Island, and now rests upright in Back Bay. Dropping onto her, you’re met with a real sense of history, the old wooden hull, though largely collapsed, still hinting at her former glory. We love picking through the debris, spotting the occasional cannon or an old pottery shard embedded in the sand. There’s a beautiful soft coral growth across the timbers, bright orange and purple, which attracts a constant stream of glassfish and schools of fusiliers. Keep an eye out for moray eels tucked into the darker crevices – a big fimbriated moray is often seen lurking. For photographers, the ambient light filtering through the clear water creates some dramatic shadows, especially in the late morning. It’s a gentle dive, maxing out at 22 metres, making it perfect for newer wreck divers or those who just want a relaxed exploration. We'd suggest getting there early to beat any potential boat traffic, as it can get a little busy.

Location: Trincomalee & East Coast, Sri Lanka, Indian Ocean & East Africa
Coordinates: 8.600166, 81.243500
Type: wreck
Maximum Depth: 22m

Marine Protected Area: Little Sober Island

Best Time to Dive in Trincomalee & East Coast

The warmest water temperatures in Trincomalee & East Coast occur in January, averaging 27.4°C. The coolest conditions are in December at 27.4°C.

Monthly Water Temperatures

January: 27.4°C (air: 25.8°C)
February: 27.4°C (air: 26.3°C)
March: 27.4°C (air: 27.3°C)
April: 27.4°C (air: 28.2°C)
May: 27.4°C (air: 28.9°C)
June: 27.4°C (air: 29.6°C)
July: 27.4°C (air: 29.4°C)
August: 27.4°C (air: 28.9°C)
September: 27.4°C (air: 28.7°C)
October: 27.4°C (air: 27.2°C)
November: 27.4°C (air: 26.0°C)
December: 27.4°C (air: 25.9°C)

Nearest Dive Centres to HMS DIOMEDE

Coco Diving Trincomalee - ["PADI"]
Dive For You - ["PADI"]
Epic Ocean Adventures - ["PADI"]
International Diving School Trincomalee - ["PADI"]
Poseidon Diving Centre - ["PADI"]
Sri Lanka Dive School

Marine Life in Trincomalee & East Coast

Home to 259 recorded species including 205 reef fish, 16 hard corals, 14 sea snails & nudibranchs, 7 sharks & rays, 6 seagrass & algae, 5 whales & dolphins.

Notable Species

Giant trevally (Caranx ignobilis) - Reef Fish
Big-eye trevally (Caranx sexfasciatus) - Reef Fish
Golden trevally (Gnathanodon speciosus) - Reef Fish
cloth-of-gold cone snail (Conus textile) - Sea Snails & Nudibranchs
Jack (Selar crumenophthalmus) - Reef Fish
Silver Sillago (Sillago sihama) - Reef Fish
Red lionfish (Pterois miles) - Reef Fish
Species code: Ea (Enhalus acoroides) - Seagrass & Algae
Bicolor Blenny (Ecsenius bicolor) - Reef Fish
Wrasse (Stethojulis interrupta) - Reef Fish
Small-eyed Squirrelfish (Myripristis murdjan) - Reef Fish
Necklace Cone (Conus monile) - Sea Snails & Nudibranchs
Manini (Acanthurus triostegus) - Reef Fish
Spangled emperor (Lethrinus nebulosus) - Reef Fish
Blue-lined Surgeonfish (Acanthurus lineatus) - Reef Fish
Redcoat (Sargocentron rubrum) - Reef Fish
Five-lined snapper (Lutjanus quinquelineatus) - Reef Fish
Herring Scad (Alepes vari) - Reef Fish
Dusky Wrasse (Halichoeres marginatus) - Reef Fish
Blue and Gold Fusilier (Caesio caerulaurea) - Reef Fish

Recommended Packing List for HMS DIOMEDE

Based on average water temperature of 27.4°C.

Shorty or Rashguard - warm 27°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