Dickwella and Tangalle

Before Entering

Verify the local operator, exact Blue Beach or Silent Beach departure and whether boat safety equipment, first aid, emergency oxygen and reliable communications are present. Ask about qualification-specific maximum depth, group ratios, night-dive training, weather cancellation thresholds and written site permissions. Nilwella Underwater Gallery is marketed as a shallow experience, but an apparently benign artificial installation can still have surge or hazards. The deeper Wombat Barge should be planned around individual certification and experience, with no untrained wreck penetration. Never attempt solo freediving or hyperventilate. A guided snorkel tour still requires flotation and a buddy plan. Freediving advice; Snorkel advice.

Between Dives and Flights

Plan surface intervals with the same personal dive computer across repetitive dives, stay hydrated and stop if feeling unwell. DAN guidance recommends at least 12 hours after a single no-decompression dive and at least 18 hours after repetitive or multiday no-decompression diving; longer intervals may be prudent and mandatory-decompression dives need specialist planning. Operators and individual computers may require more conservative rules. These are minimum recommendations, not guarantees against decompression illness.

If Diving Illness Is Suspected

End all dives, summon local emergency care, provide emergency oxygen when available under trained supervision, obtain medical evaluation promptly and consult dive-medicine emergency support. Do not delay because symptoms seem mild or rely on a nominal drive time to a chamber. DAN treatment recommendations.

Emergency number: 1990 for the government-backed Suwa Seriya ambulance service, subject to real-world network access and response limitations. Police: 119; tourism assistance: 1912; and DAN international diving emergency support +1 919 684 9111. The Sri Lankan Navy confirmed public-facing hyperbaric oxygen services at Trincomalee in October 2026. A 2026 clinical case also documents intercity transfer for recompression. These sources do not establish a functioning chamber, a trained dive physician, transport time or 24/7 dive rescue at Dickwella, Hiriketiya or Tangalle. Make the operator explain the nearest initial assessment, boat retrieval, oxygen and evacuation pathways; carry insurance explicitly covering scuba/freedive depth, marine rescue and specialist evacuation. Local hospital capability and treatment logistics need same-day confirmation. Ambulance; Navy; Clinical case; Foreign travel health guidance.

Respect Habitat and Installations

Nilwella Underwater Gallery is a Navy-documented artificial habitat and art site. Do not touch structures, feed fish, anchor onto coral, collect objects or approach marine life to force a photograph. Use an operator that can explain site access and boat mooring/anchoring practice; no universal marine-park fee or independent right of entry was verified. Support low-impact small groups and take all plastic home. Navy gallery description.

Protect Nesting Beaches

Rekawa turtles are wild and protected by community monitoring. Join the actual turtle-watch program, follow all guide directions, avoid flash and white-light disturbances, do not approach or touch adults, eggs or hatchlings, and do not buy staged turtle-release experiences. The project reports April-July as a stronger nesting period but never a guaranteed sighting. Community project.

Respect Other Local Spaces

Dress respectfully at temples, use authorized wetland boat guides and stay off unsafe coastal viewpoints. Report injured wildlife to appropriate local conservation personnel rather than trying to handle it yourself.