Planning a Dive in Thailand? New Marine Rules You Must Know

Planning a Dive in Thailand? New Marine Rules You Must Know

Effective from 22 April 2025, the Ministry of Natural Resources and Environment implemented stricter rules to safeguard the marine environment by establishing clear standards for diving and snorkeling activities.

The measures will remain legally in effect across the country for five years and are enforceable under the Marine and Coastal Resources Management Act.

 
Operator Responsibilities

  • Every trip must be accompanied by a certified dive supervisor or assistant.
  • Life vests must be provided for tourists and are required to be worn at all times when snorkeling near coral reefs, unless the tourist holds a recognized freediving certificate.


Diving Activity Regulations

  • Supervisors must brief tourists on applicable laws and responsible diving practices before any activities, including any additional legal requirements in protected areas, such as national parks or designated marine zones.
  • One supervisor is allowed to oversee up to four tourists for deep dives, and up to 20 tourists for snorkeling and freediving.
  • One supervisor is required per two learners for introductory dive sessions. Certified dive instruction may allow one instructor per four learners.
  • Photography during training or instructional dives is prohibited unless conducted by a qualified diver who has completed an Advanced Open Water certification (PADI, SSI, or equivalent) or logged at least 40 dives. Proof must be presented upon request. The same applies to divers during recreational dives.
  • Divers must remain at least two metres above coral heads.
  • If using fins, supervisors must ensure tourists understand proper control techniques and allow only those with sufficient skill to approach coral areas.

 
Restricted Activities in Coral Reef Zones

  • Contact with marine organisms is forbidden under all circumstances, including handling, moving, or displaying coral, marine animals, or any sea life.
  • Behaviours such as poor fin control that stir up sediment are banned. Feeding fish, littering, or any form of disturbance to reef habitats is forbidden.
  • Underwater walking tours, including Sea Walker and other seabed-based activities, are also prohibited in coral zones.

 
Enforcement and Penalties

  • Tourists who are unable to follow instructions must suspend their activities. Such violations must be reported to marine or national park authorities.
  • Dive operators, supervisors, and assistants who fail to enforce these rules may have their certification or operating licence revoked.

 

For more information, please contact the TAT or consult a licensed local dive centre before participating in marine activities.

 

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