Khao Lak Similan Islands Thailand

Operational Safety

• Use a reputable operator that carries emergency oxygen, has a clear diver-to-guide plan, and briefs currents, separation procedures, and pickup protocols.
• Bring an SMB and be comfortable using it. Blue-water ascents are common when current pushes the group off structure.
• Manage fatigue. Offshore days start early and can stack multiple dives with long boat rides.

In-water Safety

• Currents can be strong at pinnacles. Stay close to your buddy and guide, and avoid chasing pelagics into open water.
• Watch your depth and no-decompression limits. Many highlights sit around 18 m to 30 m, with tempting deeper contours.
• Protect your ears and hydration. Thermoclines can feel cold and lead to faster gas consumption.

Phuket is the primary regional hub for advanced medical care. Bangkok Hospital Phuket advertises diving medicine support and hyperbaric oxygen therapy capability. For any suspected decompression illness, give 100% oxygen, hydrate if conscious, and contact emergency services and a chamber network immediately. Keep your dive insurance details and emergency contacts saved offline.

If you are staying far north (near Khura Buri), plan how you would reach Phuket or another definitive care facility in a time-sensitive situation.

Marine Park Rules and Closures

• The Department of National Parks operates seasonal closures for Similan and Surin to protect ecosystems and reduce monsoon-season risk.
• Carry your park receipt or e-ticket confirmation. Rangers can request proof of payment.

Low-impact Diving and Snorkeling

• Do not touch coral, stand on reef, or feed fish.
• Practice tight buoyancy and fin control, especially on shallow coral slopes.
• Use moorings rather than anchoring whenever possible.
• Reduce single-use plastics on boat days by carrying a reusable bottle and bag.

Cultural Respect

• If your itinerary includes Surin cultural context, follow local guidance and avoid intrusive photography of community life.