Written by DiveJourney. Built from public sources and local operator knowledge. Last updated Mar 4, 2026.

• DiveJourney: Koh Tao destination guide - Country-relevant Gulf of Thailand conditions (water temperature and visibility ranges), seasonality, and logistics snapshots (updated Jan 23, 2026).
• DiveJourney: Khao Lak and Similan Islands destination guide - Andaman offshore seasonality and water temperature range for the Similan-Surin circuit (updated Jan 23, 2026).
• THAILAND.GO.TH: Marine rules for diving and snorkeling (effective 22 April 2025) - Government summary of national rules for diving and snorkeling activities, including supervision and coral-zone safety behavior.
• Thailand PRD: Similan and Surin seasonal closure and e-ticket note - Government news release on Similan and Surin closure dates and reopening guidance (includes e-ticket references).
• Thailand Digital Arrival Card (TDAC) manual - Official TDAC guidance, including the submission window and that TDAC is a travel information submission (not a visa).
• Royal Thai Embassy Kuala Lumpur: Entry to Thailand without a visa - Official embassy guidance on visa exemption rules (updated Oct 7, 2025).
• THAILAND.GO.TH: The seasons of Thailand - Government overview of Thailand's seasonal patterns, useful for monsoon and travel planning.
• THAILAND.GO.TH: Emergency contact numbers - Government list of key emergency numbers (police, medical, and related hotlines).
• Bangkok Hospital Phuket: Diving Medicine Center - Hospital-based diving medicine and hyperbaric oxygen therapy service information (includes contact details and on-call notes).
• SSS Recompression Chamber Network: Samui facility - Recompression chamber network information for the Surat Thani district (Koh Samui, Koh Tao, Koh Phangan coverage).