Pattaya is the Gulf of Thailand's wreck hub and the nearest diving to Bangkok: two navy landing ships purpose-sunk as dive wrecks (HTMS Khram 2003, HTMS Kut 2006), the RAF-bombed WWII freighter Hardeep, and the 1920-lost steamship Petchburi Bremen, all in day-boat range. Visibility is honestly modest — 2–10 m on a typical day, tide-dependent — and the island reefs are shallow and unremarkable, but the wrecks, year-round diveability and two-hour transfer from Bangkok keep boats full.
Destination info
Conditions, highlights, and the resident marine life.
Conditions
Water and air temperature across the year.
WaterAirDryShoulderWet
Description
Pattaya is a high-rise resort city about two hours southeast of Bangkok, far better known for its nightlife than its sea, and the underwater honesty matters: this is green, plankton-rich Gulf water with 2–10 m visibility on a typical day, modest shallow fringing reefs, and heavy tour-boat and jet-ski traffic. What earns it a place is the Gulf's best wreck collection. The Royal Thai Navy purpose-sank two WWII-era American landing ships as prepared dive wrecks — the 62 m HTMS Khram (ex-USS LSM-469, commissioned March 1945, transferred to Thailand in 1962, scuttled 300 m off Ko Phai on 30 January 2003) and her near-sister HTMS Kut (ex-USS LSM-333, scuttled just north of Koh Sak on 17 September 2006) — both stripped of armaments and oil, with penetration holes pre-cut. South around Samaesan and Sattahip lie the serious dives: the Hardeep (properly SS Suddhadib), a 68 m steamer sunk by RAF bombers on 1 June 1945 that divers can swim through end to end, the 1901-built steamship Petchburi Bremen (lost 1920, strong-current slack-water diving), and a genuine technical scene built around the 85–100 m Samaesan Hole. The Near Islands (Koh Larn, Koh Sak, Koh Krok) are shallow, sheltered training reefs 40 minutes out; the navy-controlled Far Islands (Ko Phai group, Koh Rin) have noticeably better coral and visibility but access depends on Royal Thai Navy rules, which have tightened abruptly before (2017 Far Islands closure; Ko Chuang declared off-limits in February 2025). Diving runs year-round — Pattaya's east-of-the-Gulf position keeps it workable when Thailand's Andaman coast closes — with the best window November–April; May–October monsoon swell lowers visibility and can cancel far-island and wreck trips.
Highlights
What makes this dive worth the trip.
The HTMS Khram was purpose-sunk by the Royal Thai Navy 300 m off Ko Phai on 30 January 2003 as Thailand's first wreck sunk specifically for divers and marine life: armaments, oil and most hazards removed, large penetration holes pre-cut so passageways rarely leave natural light, resting at 15–30 m with deck gun mounts still in place.
Her near-sister HTMS Kut (ex-USS LSM-333, Thai Navy vessel 731) was scuttled at 10:30 am on 17 September 2006 just north of Koh Sak to mark King Bhumibol's 60th year on the throne — the closest wreck to Pattaya Beach, prepared by the navy with engines removed and swim-through routes cut, top at about 10 m and seabed at 30 m.
The Hardeep is really the SS Suddhadib, a 68 m steamer built in Hong Kong in 1918 and sunk at 12:55 pm on 1 June 1945 by RAF B-24 Liberators of 99 and 159 Squadrons while running fuel for the Japanese-allied Thai government; she lies on her starboard side in 26 m off Koh Chuang and divers can swim her full length inside — but two unexploded 1,000 lb bombs still sit 100–150 m aft of the wreck at 27–33 m.
Marine life
29 species you’re likely to encounter on a dive here.
Dive sites
7 signature sites at this destination.
HTMS Khram Wreck
A 62 m US-built WWII Landing Ship Medium (ex-USS LSM-469, transferred to the Royal Thai Navy in 1962) purpose-sunk 300 m off Ko Phai in the Far Islands on 30 January 2003 as Thailand's first navy-prepared dive wreck. She sits upright with the seabed at 30 m and the top around 15 m, gun mounts intact, and large pre-cut openings that keep most penetration routes in natural light — interior features include the bridge, mess room, infirmary and tank deck. Pattaya's most popular dive, and a standard Advanced/wreck-training site; the main challenge is the often-low Gulf visibility rather than depth or current.
15–30 mintermediateDay boatLightVisibility 2–15 m
HTMS Kut Wreck
The Khram's near-sister (ex-USS LSM-333), scuttled north of Koh Sak on 17 September 2006 for the 60th anniversary of King Bhumibol's accession — the closest wreck to Pattaya Beach, about 45 minutes from Bali Hai pier. The seabed is at 30–31 m, the superstructure tops out around 10–13 m, and the main deck runs 22–25 m, which puts most of the dive in Advanced territory. The navy stripped the engines and cut three swim-through routes into the engine room with direct outside access, making it a standard wreck-specialty training platform. Watertight doors remain and can swing shut — penetration training applies.
13–31 madvancedDay boatLightVisibility 5–20 m
Hardeep Wreck (SS Suddhadib)
A 68 m Hong Kong-built (1918) steamer sunk by RAF B-24 Liberators on 1 June 1945, lying on her starboard side in 26 m between Koh Chuang and Koh Rong Khone off Samaesan, about 45 minutes south of Pattaya. The Gulf's classic wreck dive: both cargo holds offer well-lit penetration, the steam engine was salvaged through a hull cut that opens the engine room (coal lumps still piled by the three boilers), and a competent wreck diver can swim her full length without exiting. Dived by Pattaya, Jomtien and Samaesan operators; tidal currents can be strong, so trips plan around slack water. Two unexploded 1,000 lb bombs lie 100–150 m aft at 27–33 m — look, don't touch.
16–26 madvancedDay boatModerateVisibility 3–12 m
Petchburi Bremen Wreck
An 88.5 m steamship built in 1901 at Bremerhaven for North German Lloyd as the Petchaburi, confiscated by Siam in 1917 and renamed Kaeo Samud, then lost on 27 December 1920 after striking an uncharted rock with a rice cargo bound for Swatow. She lies partially broken up — bow and stern separated by a sand dune — on a 22–24 m sandy bottom in the Khram channel south of Pattaya. A drift/slack-water dive for experienced divers: currents in the channel are strong, there is no permanent mooring (boats locate her by GPS and sounder), and Thai Navy activity in the area occasionally turns dive boats away. Three large eagle rays are regularly reported on the wreck.
18–24 madvancedDay boatStrongVisibility 3–12 m
Koh Sak
A small horseshoe island ~10 km west of Pattaya in the Near Islands, 40 minutes by boat, and the area's standard training and check-out reef: shallow coral slopes averaging 10 m, sheltered from strong current year-round. The honest pitch is convenience, not spectacle — modest hard-coral cover, 5–20 m visibility, and heavy tour-boat and jet-ski traffic overhead (surface marker discipline matters). It compensates with reliable residents: operators report a handful of resident sea turtles, plus muck-style finds — seahorses, nudibranchs and moray eels — on the sand and rubble.
4–16 mbeginnerDay boatLightVisibility 5–20 m
Koh Rin
The pick of the navy-controlled Far Islands, 70–90 minutes out, with Pattaya's best reef diving: rock pinnacles and coral bommies at North Rock (Hin Khao) and the rarely-dived South Rock (Hin Ton Mai), with hard corals, barrel sponges, gorgonians and sea whips in noticeably clearer water than the Near Islands. Ledges and overhangs shelter brownbanded bamboo sharks and morays, with schooling snappers, jacks and fusiliers over the rocks; blacktip reef sharks and eagle rays are occasional, not expected. Currents pick up around the pinnacles — most operators treat it as a second-level site.
5–22 mintermediateDay boatModerateVisibility 8–20 m
Samaesan Hole
The Gulf of Thailand's deepest dive site: a seabed depression off Koh Samaesan dropping to 85–100 m, first dived in 1998 and memorably described by its pioneers as the 'black silty hole of death'. Strictly a technical dive — hypoxic trimix, staged decompression, and an experienced Sattahip/Samaesan tech operator — inside an area charted as an Explosives Dumping Ground, with old ordnance on the bottom, some of the strongest and least predictable currents in the Gulf (including vortex-like down-currents at 45–60 m), darkness below 60 m, and commercial shipping overhead. Marine life is minimal; this dive is about the abyss, not the animals. Included here because it defines the area's serious technical scene — recreational divers should not consider it.
40–100 madvancedDay boatVery strongVisibility 5–10 m
Where to dive & stay
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