The Gulf of Thailand, historically recognized as the Gulf of Siam, is a shallow inlet[1][2] adjoining to the southwestern South China Sea, bounded between the southwestern shores of Mainland Southeast Asia and the northern half of the Malay Peninsula. The gulf’s many coral reefs have made it enticing to divers visiting Thailand.

The best concentration of deep technical dive sites is in the Samae San Island space. It presents a variety of the deepest technical dives in the Gulf of Thailand which can be also simply accessible[3]. Numerous deep wreck dives are current within the Gulf of Thailand however these require extended boat journeys and further safety and logistical concerns. Koh Tao gives two easily accessible tec diving sites however these have a lot shallower depth in comparison with other tec diving areas in the Gulf of Thailand

Identify Max. depth Coordinates Location Sort of Dive

Samaesan Hole[4][5] 100-85 m (328-279 ft) 12°32.314′N 100°57.616′E / 12.538567°N 100.960267°E / 12.538567; 100.960267 Samae San Island Open ocean

Sharkfin Deep Drop / Samaesan Cliff [4][5] 85-50 m (279-164 ft) 12°31.705′N 100°56.020′E / 12.528417°N 100.933667°E / 12.528417; 100.933667 Samae San Island Open ocean / Wall

1/four Mile Mouthpiece Drop[5] 75 m (246 ft) 12°30.094′N 100°57.233′E / 12.501567°N 100.953883°E / 12.501567; 100.953883 Samae San Island Open ocean

Tattori Maru[6] seventy five m (246 ft) 9°58.00′N 101°05.00′E / 9.96667°N 101.08333°E / 9.96667; 101.08333 [7] a hundred and twenty nmi (220 km; 140 mi) east of Koh Tao Wreck

Drillship Seacrest[6][8] 73 m (240 ft) 08°3.806′N 101°39.433′E / 8.063433°N 101.657217°E / 8.063433; 101.657217[9] 170 nmi (310 km; 200 mi) northeast of Songkhla Wreck

USS Lagarto[6] 70 m (230 ft)[10] 7°55′N 102°18′E / 7.917°N 102.300°E / 7.917; 102.300[11] Ko Losin Wreck

Thunder Bowl[5] sixty five m (213 ft) 12°32.807′N 100°55.655′E / 12.546783°N 100.927583°E / 12.546783; 100.927583 Samae San Island Open ocean

HTMS Pangan[6] sixty five m (213 ft) No report 60 nmi (one hundred ten km; Sixty nine mi) northeast of Koh Tao Wreck

Narcosis Colosseum[5] 50 m (160 ft) 12°30.128′N 100°57.191′E / 12.502133°N 100.953183°E / 12.502133; 100.953183 Samae San Island Open ocean

Koh Rong Nang Training Buoy[5] 50-37 m (164-121 ft) 12°32.968′N 100°57.298′E / 12.549467°N 100.954967°E / 12.549467; 100.954967 Samae San Island Reef

HTMS Sarasin[12] 43 m (141 ft) No record Pattaya Wreck

PAK 1/Koho Maru-5[13] forty three m (141 ft) 12°05.504′N 101°40.931′E / 12.091733°N 101.682183°E / 12.091733; 101.682183 Koh Chang Wreck

Chumphon Pinnacle[14] 40 m (130 ft) 10°10.350′N 99°46.722′E / 10.172500°N 99.778700°E / 10.172500; 99.778700 Koh Tao Reef

Sail Rock/Hin Bai[15] forty m (130 ft) 9°55.615′N 99°58.618′E / 9.926917°N 99.976967°E / 9.926917; 99.976967 Koh Tao Reef

^ “Marine Gazetteer browser”. Marineregions org. Retrieved 6 June 2016.

^ “Thailand, Gulf of”. Oxford College Press. Archived from the original on 30 October 2014. Retrieved 6 June 2016.

^ Ryland Cairns. “Thailand’s Hidden Gem for Tec Divers”. PADI Blogs. PADI. Archived from the original on 4 April 2026. Retrieved 4 April 2026.

^ a b “Technical Dive Sites – Thailand”. Thai Wreck Diver. Archived from the original on 19 February 2026. Retrieved 19 February 2026.

^ a b c d e f “Diving in Pattaya – Gulf of Thailand’s finest tec websites”. Thai Tec Diver. 14 February 2026. Archived from the original on 19 February 2026. Retrieved 19 February 2026.

^ a b c d “Top 5 Technical Wreck Dives in Gulf of Thailand”. Sea Explorers Club. Archived from the unique on 27 February 2026. Retrieved 27 February 2026.

^ “IJA/IJN TOTTORI MARU: Tabular Report of Motion”. Combined Fleet. Archived from the unique on 13 August 2017. Retrieved 27 February 2026.

^ Tim Lawrence. “Moon-pool Mission: Diving Thailand’s Tragic Seacrest drillship”. Diversnet. Archived from the original on eleven April 2026. Retrieved 11 April 2026.

^ “DS Seacrest”. Thailand Wrecks. Archived from the original on 27 February 2026. Retrieved 27 February 2026.

^ “Sunken Sub Seems to be USS Lagarto”. Retrieved 27 February 2026.

^ “Lagarto (SS 371)”. Naval Historical past. Heritage Command. Retrieved 27 February 2026.

^ “Greatest Tec Diving Spots in Gulf of Thailand”. Seafari. Retrieved 27 February 2026.

^ “Pak 1 – Vertical Wreck”. Thai Wreck Diver. Retrieved 27 February 2026.

^ “Chumphon Pinnacle”. Black Turtle Dive. Retrieved 27 February 2026.

^ “Sail Rock (Hin Bai)”. Black Turtle Dives. Retrieved 27 February 2026.

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Technical diving

Underwater diving sites in Thailand

Vacationer sights in Thailand

This web page was final edited on 10 Might 2026, at 10:37 (UTC).

Checklist of deepest dive sites within the Gulf of Thailand

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