HMS Hermes - Trincomalee & East Coast

The San Diego wreck isn't just a hunk of metal on the seabed, it’s a portal back to 1600. We love it because it’s a proper piece of history, sunk in a naval battle, and now a fantastic dive. Drop down and you’ll find cannons, jars, and plates scattered amongst the structure, still largely intact despite the centuries. It sits on a sandy slope, starting at around 18 metres and dipping deeper, so it’s accessible for Advanced Open Water divers. What makes it special for us is the mix of history and current life. You’ll weave through the timber ribs and iron hull, spotting enormous groupers lurking in the shadows. Look for flat-faced seahorses clinging to the growth, or maybe a cleverly camouflaged anglerfish waiting for dinner. The visibility here can vary, but even on an average day, the sheer scale of the wreck and the stories it whispers make it a truly engaging dive. Go early to avoid the crowds; it's a popular spot for a reason.

Location: Trincomalee & East Coast, Sri Lanka, Indian Ocean & East Africa
Coordinates: 7.583000, 82.083000
Type: wreck

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 Hermes

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 Hermes

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