Few wrecks anywhere carry the history of HMS Hermes. On 9 April 1942, Japanese carrier aircraft sank the Royal Navy's aircraft carrier in less than 10 minutes. It was the first time in history a carrier was sunk by carrier-based planes. Today, 83 years later, she rests on the seabed of Trincomalee Bay, 35 minutes from our jetty at Sandy Cove, covered in coral and surrounded by clouds of batfish.
The numbers are striking: 182 metres long, 50 metres at the beam, lying on her starboard side in 27-52 metres of water. The flight deck fans out horizontally at around 35 metres, a reference point for orientation on the dive. The island structure (the raised command section on the port side) reaches up to 27 metres, making it accessible to Advanced Open Water divers on a good visibility day.
What you'll see on the dive. The outer hull is one of the most densely colonised surfaces in Sri Lankan waters. Large fans of orange and yellow soft coral cling to the ship's sides. Lionfish tuck into every crevice. Schools of batfish numbering in the hundreds wheel slowly above the deck. On deeper sections past 40 metres, you will encounter barracuda hunting in formation and large grouper sheltering beneath overhang points. The prop shafts are encrusted with growth so thick the metal underneath is barely visible.
Visibility and conditions. Visibility on HMS Hermes averages 15-25 metres between June and September, when the northeast monsoon has fully retreated and the bay settles. In May and October, the shoulder months, expect 10-15 metres. The site is exposed enough that a surface swell creates mild current across the hull, but the wreck itself creates shelter on the lee side. Morning dives (departing 07:30) consistently produce better conditions than afternoon runs.
Water temperature sits at 28-30 degrees C year-round at this depth. A 3mm shorty wetsuit is comfortable. Some divers prefer a 5mm full suit for longer bottom times. We supply wetsuits in all sizes if you haven't brought your own.
Certification requirements. The shallow sections (island structure at 27 m) are accessible to PADI Advanced Open Water certified divers, or to Open Water divers accompanied by a dive professional staying above 30 metres. The full wreck, including the deeper sections of the hull and the prop area at 52 metres, requires Advanced Open Water at minimum. Our Wreck Diver specialty and Deep Diver specialty are both conducted here, giving you the skills to penetrate safely and to manage narcosis at depth.
Dive planning. Bottom time at 35 metres (average working depth on the deck) gives you roughly 25-30 minutes before a safety stop. We run two-tank trips: the first dive is a full-wreck orientation at recreational depth limits (30-35m for most divers), and the second is a shallower reef dive on a nearby site. Nitrox is available from our station if you want to extend bottom time. Our Enriched Air Nitrox course is the fastest specialty to complete before your trip.
History in brief. HMS Hermes was commissioned in 1924 as the Royal Navy's first purpose-built aircraft carrier. She served in the Atlantic and Indian Ocean and was based at Trincomalee in early 1942 during the Japanese Indian Ocean Raid. When the attack came on 9 April, Hermes had no aircraft aboard. They had been sent ashore for safety. She took 40 direct hits and sank in under 10 minutes. Of her crew of 590, 307 were lost. She was discovered by divers in the 1990s and has since become one of Asia's top wreck dives.
How to book. HMS Hermes is included in our Fun Diving packages (Advanced Open Water required) and is the main site for our Wreck Diver and Deep Diver specialty courses. Send us a message on WhatsApp or call 0743 945 010 and we will arrange everything: briefing, equipment, boat, and guide.