7 Phuket Day-Trip Dive Sites Worth Your Bottom Time

You don't need a four-night liveaboard to dive in the Andaman. From Chalong Pier, a day boat can put you on a leopard shark cleaning station, a 30-metre car ferry wreck, or a vertical limestone wall before dinner. This is a field guide to the 7 sites that actually rotate through Phuket day-trip schedules — what's good about each, what's not, and who they're for.

All times below are from Chalong Pier. Boats typically leave 08:00-09:15 and return 17:30-18:30, with 2-3 dives and a cooked lunch between dives 1 and 2.

1. Racha Yai — The Training Ground

Boat time: ~75-90 min south. Depth: 3-25 m. Level: Open Water and up (some spots fine for try-dives).

Racha Yai is the island operators send you to when conditions elsewhere turn. Bay 1 has two deliberately sunk wrecks (a harbour tug and a small patrol boat) plus a concrete "underwater motorcycle" that has become a photo cliche for good reason. Siam Bay on the south side has concrete elephant sculptures at 18-22 m and healthy hard coral gardens sloping to 25 m. Visibility is usually the best of any day-trip site — 15-25 m is normal.

What you see: Blacktip reef sharks on the early dive, octopus in the shallows, moray eels, occasional turtles, seahorses if your guide knows where to look.

Downside: Every shop on the island runs here, so expect other boats on the mooring. The "easy" profile also means experienced divers can find it underwhelming as a first dive.

2. Racha Noi — Where the Current Lives

Boat time: ~2 h 15 min south (past Racha Yai). Depth: 12-40 m. Level: Advanced Open Water recommended.

Racha Noi is the rougher sibling. Marita's Rock and the South Tip are granite-boulder sites with real current — the payoff is bigger pelagic action. Manta Point on the west side is named for a reason, though sightings are seasonal (February-April) and never guaranteed. The boulders start around 18 m and you can easily drop past 30 m if you're not watching.

What you see: Schooling barracuda, giant trevally, occasional manta rays, whale sharks during plankton blooms, reef sharks cruising the sand channels.

Downside: Currents can shut the site down. Long surface intervals on the crossing back — if you get seasick, bring tablets.

3. Shark Point (Hin Musang) — The Leopard Shark Lottery

Boat time: ~90 min east. Depth: 5-24 m. Level: Open Water.

A Thai marine sanctuary since 1992. Three limestone pinnacles — only the top of Pinnacle 1 breaks the surface — covered in purple and pink soft coral so dense the rock disappears. You drop on the mooring and spiral around at 18-22 m looking for leopard sharks resting on the sand between pinnacles.

What you see: Leopard sharks (best odds early morning, often none by the second dive), schooling yellowtail snapper, seahorses, ghost pipefish, the full soft-coral colour palette.

Downside: Shark sightings are genuinely a lottery — go in expecting the corals and treat sharks as a bonus. Current between pinnacles can be strong.

4. Anemone Reef (Hin Jom) — The Submerged Pinnacle

Boat time: ~90 min east (next door to Shark Point). Depth: 5-26 m. Level: Open Water, Advanced preferred.

A limestone pinnacle that tops out 5 m below the surface and drops to 26 m, completely wrapped in carpet anemones — every square metre is orange, pink, or purple anemone with resident clownfish. Famous among Phuket locals because this is the rock the King Cruiser hit in 1997.

What you see: Anemones at density you won't see anywhere else in the Andaman, lionfish, scorpionfish, schooling fusiliers, occasional leopard shark overflow from next door.

Downside: No shallow reference once you leave the pinnacle — easy to lose the site in current. Boats usually pair this with Shark Point, so repeat visits feel similar.

5. King Cruiser Wreck — The 85-Metre Ferry

Boat time: ~2 h east. Depth: 12-33 m (sand at 33 m). Level: Advanced Open Water minimum.

The Songserm ferry sank in 1997 after hitting Anemone Reef; nobody died, and 29 years later she sits upright in the sand, four decks tall. The wheelhouse is at 12 m, passenger decks at 18-22 m, sand at 33. Swim-throughs on the upper decks are diveable if your guide is cautious; the top deck at the stern has collapsed and penetration is now off-limits.

What you see: A resident huge barracuda, schools of yellowtail snapper packed so tight they shade the wreck, scorpionfish on the rails, hawksbill turtles, the occasional bull shark in recent seasons.

Downside: 50 minutes at 22 m eats your no-deco time fast — plan your gas and your computer. Viz on the wreck drops with plankton and can be 5-8 m in monsoon season.

6. Koh Doc Mai — The Vertical Wall

Boat time: ~60 min east. Depth: 5-30 m. Level: Open Water.

"Flower Island" is a small limestone pillar 20 km east of Phuket. The east wall drops vertically from the surface to 30 m; the west side is a gentler slope. You pick a depth, pick a direction, and just cruise the wall. It's the closest deep wall to Phuket and the fallback when weather kills the longer runs.

What you see: Sea-fan crevices with tiger-tail seahorses and bargibanti pygmies if you have a good guide, nudibranchs in double figures, moray eels, banded sea kraits, occasional leopard sharks sleeping on the sand at the base.

Downside: Current on the wall can be strong and unpredictable. Not a site for big pelagics — this is macro and wall-texture diving.

7. Koh Phi Phi (Bida Nok, Bida Nai, Hin Bida) — The Scenic Package

Boat time: ~2 h east. Depth: 5-30 m. Level: Open Water.

Two limestone islets south of Phi Phi Leh with vertical walls, swim-throughs, and a sandy plateau at 20 m. Hin Bida (Phi Phi Shark Point) is the third site, a shallow reef with a consistent leopard shark population on the sand at 18-20 m. Boats usually run 2 dives at Bida + 1 at Shark Point or Anemone Reef on the way home.

What you see: Leopard sharks on the sand at Hin Bida, blacktip reef sharks in the morning at Bida Nok, turtles, schooling chevron barracuda, nudibranchs on the walls, dramatic limestone topography above water on the surface interval.

Downside: Phi Phi is a mass-tourism destination — expect speedboats overhead and crowded moorings in the November-April season. Surface intervals in Maya Bay are a zoo.

Practical: Picking a Day and a Boat

High season runs mid-October to late April. Seas are flattest December-March. May to mid-October is monsoon — some sites close, Racha Noi runs rarely, but King Cruiser and Shark Point remain diveable on good-weather windows and boats are half the price.

Most Phuket shops run a 5-day rotation: Racha Yai+Noi / King Cruiser+Shark Point+Anemone / Phi Phi+Bida / Koh Doc Mai+Shark Point / repeat. If you've got 3 days, do Racha + Wreck day + Phi Phi. If you've got 5, add a macro day at Koh Doc Mai.

Pick a boat that limits group size to 4 per guide, carries oxygen and a functioning O2 kit on deck, and gives you a proper dive briefing with a site map. That eliminates about two-thirds of the cheap options at Chalong.

For planning help, operator comparisons, and seasonal conditions across the Andaman, siamdive.com publishes weekly updates from Phuket-based divers.

Bottom line: Phuket day-trip diving will never replace a Similan liveaboard — but it doesn't need to. Seven sites, each with a genuine reason to get wet, all within a sunrise-to-sunset boat ride.