HMS Hermes technical diving clearance: gas blending and permits in Batticaloa?
4 Answers from travellers
Diving HMS Hermes requires clearances from both the Department of Archaeology (she is classified as a historic war grave) and the Sri Lanka Navy Eastern Command. Only certified technical diving outfits based in Batticaloa or Trincomalee can file passenger manifests. Trimix (typically Tx 18/45 or 21/35) and medical-grade booster oxygen must be arranged weeks ahead; helium availability across the Eastern Province is limited and usually shipped from industrial depots in Sapugaskanda.
Bottom temperatures hover at 27-29°C, but thermoclines below 45 meters can drop sharply. Bringing a 3mm or 5mm full suit with silicone seals is recommended over rashguards.
Entering with oxygen analyzers and personal rebreather sorb requires filing a commercial manifest at CMB Customs; carrying loose Sofnolime canisters in checked baggage triggers immediate chemical security holds.
Pelagic life around the wreck includes dogtooth tuna and massive bull sharks; keep situational awareness high when conducting mandatory decompression hangs along the shot line.
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