Koh Tao

07:40 — Nobody knocks on your door

You wake up because the light is in the room, not because anybody called you. The road outside is already going — a scooter, a dog, somebody hosing down a deck.

Nothing today needs you yet. But you can hear the bay from where you are standing, and it is doing something different to yesterday.

09:30 — Coffee, and a wind report nobody wrote down

You come down to the water with wet hair and order something cold. There are divers at the next table with kit half on, arguing about nothing.

Somebody walks past and says the north side is flat, which means the far rock is on. Therefore your whole morning changes shape in about four seconds, and you go and find your fins.

10:30 — The engine, and the island getting smaller

The boat goes when everybody is on it, not when a clock says so. Your tank is already aboard and already set up. You sit on the rail with your back to the island, salt drying tight on your shins.

The briefing comes over the engine — the site, the depth, which way the current will run. But nobody says out loud the thing you notice at the mooring line: there is no one else on it.

11:15 — Backward off the rail onto a rock with nobody on it

You go in backwards and the water takes your weight before you have finished the breath. It is warm enough that none of it is a shock, which is not true of most places people learn. Down the line, and the blue starts holding shapes — granite, furred over with anemones that lean when the water leans.

But the part you will describe badly to people at home is the quiet. No other bubbles. Nobody herding you off the rock.

13:15 — Pineapple on a hot deck, and the second one

You come up with your ears ringing slightly and everything tasting of salt. Somebody puts out cold water and cut fruit, and the deck is hot enough through the soles of your feet that you keep shifting.

Nobody times your surface interval to the minute. Therefore the second one goes in when the group is actually ready, which is usually why it is the better of the two.

18:45 — Salt off, and the light going over the bay

You walk back up the road with your hair stiff and a burnt stripe on each forearm where the wetsuit stopped. Cold shower, then straight back down, because the light does something over Chalok at this hour worth standing outside for. Somebody off the boat is already at a table with a beer sweating in front of them.

But you do not sit down for dinner. You sit down because they have started arguing about where the wind is going tomorrow.

Chumphon Pinnacle

12–40m · Boat · Intermediate to Advanced

There is no bottom under you when you drop, just a line going down and a temperature that loses a degree as you follow it.

Then it arrives — a whole mountain of granite you cannot see the ends of, furred over with soft coral and anemones that breathe with the surge. Your own bubbles go suddenly loud against something solid. Lionfish hang off the edges of it doing nothing at all, and the pink anemonefish will come out and square up to a mask twice their size.

But nobody spends this one looking at the rock. Therefore you keep drifting back to the open side and checking the blue, because this is where the big spotted one comes past when it comes past at all.

Southwest Pinnacle

5–30m · Boat · Advanced

It takes three quarters of an hour to get out here, which is why most of the island never bothers.

What you get for the ride is towers of granite rising out of open water with nothing around them, and current — real current, the kind you swim into on the way out so it carries you home. That current is the whole point. It drags nutrients past the rock and the rock holds everything that wants to eat: great barracuda hanging like knives, giant grouper, oxeye scad turning in a single sheet, blue-spotted stingrays parked in the sand between the towers.

But the honest reason this site has a reputation is what happened here on the second of January. Therefore nobody says the words out loud on the ride out, and everybody scans the blue anyway.

Shark Island

5–20m, to 35m at the wreck · Boat · Advanced

This is the closest one, and it is also one of the best, which almost never happens.

The rock comes out of the sea in the shape of a fin and keeps going down. Because it sits out of the bay the current can be firm, and firm current means food, and food means everything: batfish drifting in pairs, great barracuda, sea snakes threading the reef, blacktip reef sharks in the shallow end where the surge is loudest. The soft coral on the deep side goes purple and orange in torchlight.

But if you have the training there is more underneath. Therefore the divers who came for a shallow reef end up hanging over the MV Trident at thirty-something metres, watching the shape of it come out of the green.

White Rock

16m average, 28m maximum · Boat · All levels

This is the one that makes people book a second morning.

It is not deep and it does not need to be. Two ridges of rock and coral running north to south, sixteen metres for most of it, and the light comes all the way down so the colour never washes out. Morays go in and out of the same holes all dive. Blue-spotted stingrays come up out of the sand in front of you in a small grey cloud. Turtles turn up on good days and completely ignore you.

But the boundary of this site is a suggestion rather than a line. Therefore if the air is going well you keep swimming south, and the wreck and Hin Pee Wee are both waiting on the other side of it.

Twins Rock

5–18m · Boat · All levels

This is where almost everybody on this island took their first proper breath underwater, and it deserves better than being called a training site.

The depth never gets away from you. Two rock formations side by side with a channel of white sand between them, fusiliers coming over the top in sheets that catch the light, anemonefish coming out to see you off. Blue-spotted ribbontail rays lie in the channel and only move when you are almost on top of them, and morays watch the whole thing from the cracks.

But swim a little further and the seabed stops being natural. Therefore your buoyancy dive turns into something stranger: Buoyancy World, a set of built structures put down on purpose, where you find out exactly how well you can hover.

Laem Thian

3–15m south, 17–25m north · Boat · Intermediate to Advanced for the caves

Nobody puts this bay on a first page, and that is exactly why you should ask for it.

Go south and it is three to fifteen metres of sand bank and gentle slope, so bright you can read your gauge without turning the torch on, with juvenile harlequin sweetlips wobbling around like they are broken.

Go north and the whole thing changes character. The rock closes over your head and the swim-throughs start, seventeen to twenty-five metres, light coming down through gaps in the ceiling in solid columns. Bumphead parrotfish crunch somewhere you cannot see. But a cave punishes sloppy fins and rewards nothing else. Therefore this one is a reason to get better rather than a place to be a beginner.

HTMS Suphairin

11–27m · Boat · Advanced

She was a high-speed attack vessel with the Gulf Patrol Fleet for forty-two years. She was decommissioned in 2018. In September 2023 they opened her seacocks northwest of Noname Pinnacle and let her go down.

What you find is forty-five metres of ship sitting upright in eleven to twenty-seven metres of water, with her gun still trained forward across an empty foredeck. The steel is cold under a glove even when the water is warm. Sound behaves differently around a hull that size — your bubbles come back at you off the plating.

But she was not sunk to be a curiosity. Therefore the interesting thing to look at is not the gun: it is the first coral colonies already fixed to a deck that was Navy grey two years ago.

A day on the reef with the science team

diving

It starts in a room with a whiteboard and it finishes with your hands on a coral frame.

The morning is a proper lecture — one topic, taught by a marine biologist who has been working this reef for years, not a fifteen-minute talk to justify the word conservation. Then you get in the water and do the thing you just learned: laying transects, taking data, or tying nursery-grown fragments onto steel.

But the part nobody warns you about is the clock. Therefore this dive is not on a schedule — you stay down until the work is finished, which on a good day is the longest you have ever been underwater in one go.

Open Water Diver course

courses

Three days, and the water is warm the whole way through, which matters more than anybody tells you.

You do the theory online before you land. Then it is confined water in the shallows, breathing underwater for the first time and finding out that the panic you were expecting does not arrive. After that it is the real sites — Twins, White Rock, the ones the certified divers are on.

But the number that decides whether you enjoy this is not the price. Therefore the thing to look at is the group: four people to one instructor means your instructor is watching you specifically, not counting heads in a line.

Advanced Adventurer course

courses

Five dives, and each one is a different problem.

Deep takes you to thirty metres, where colours have gone and your own thinking gets slightly slower and you notice it happening. Navigation makes you find your way back to a boat you cannot see. Buoyancy is the one that changes your diving forever, and here it is taught on purpose-built structures rather than over live coral.

But the dive people talk about afterwards is the night one. Therefore you go in at the end of a day you have already spent underwater, put a torch on the reef, and find out that it is a completely different animal after dark.

Try freediving, one morning

experiences

You need to be able to swim. That is the entire prerequisite.

The first part happens sitting down, and it is about breathing — which sounds like the boring part and turns out to be the whole thing. Then you get in, and the first time you go down without a tank the silence is so complete it is almost rude. No bubbles. No noise. Just the pressure arriving in your ears and the surface getting further away in a way that stops being frightening surprisingly fast.

But the reason people book a second one is not depth. Therefore expect to come up from thirty seconds underwater feeling like somebody has reset something, and to spend the rest of the afternoon quieter than you were.

Breath work and yoga above the bay

experiences

It is ten minutes across the island and it feels like a different one.

The shala is timber, thatched, open on all sides, on a hill above Aow Leuk with Shark Island sitting out in the water in front of you. Morning class is a flow that wakes your shoulders up before you carry a tank. Evening is yin — long holds, everything going quiet, insects starting up in the trees behind you.

But the class to ask about is pranayama. Therefore you end up learning the same breathing the freedivers use, from the same person, and finding out that the two things were never separate.

Snorkelling the bay the science team looks after

experiences

Half the year this bay is a swell. The other half it is a swimming pool with a reef in it.

When the wind comes round, between April and October, Aow Leuk goes glass-flat and you can walk straight in off the sand with a mask. The coral starts almost immediately — this is one of the stretches the conservation team surveys and replants, so what you are floating over is reef somebody is actively looking after.

But the thing nobody prepares you for is the sharks. Therefore the first time a blacktip comes through the shallow end while you are standing waist-deep, you will find out very quickly what you actually think about sharks.

The sea-view double over the beach club

Purple · above the water

Thirty-six square metres, and one wall of it is the bay

There are four of these and they are all in a row on the second floor, above the beach club, looking straight out at Chalok.

Thirty-six square metres is a lot of room for two people, and the balcony is where you will actually be. Under it there is a pool with bean bags round it and a string of lights that comes on at dusk, and past the pool there is sand. Air conditioning, a hot shower, a fridge, a kettle — the ordinary things, but with the sound of the bay coming through the door all night.

But the reason to take this one is the hour after diving. Therefore you will find yourself out on that balcony at six with salt still on you, watching the longtails come in, and it will take you twenty minutes to decide to go downstairs.

The twin up the hill

Red · in the trees

Up the hill, in the trees, and nobody walks past

It is up a hill and across a road, and that walk is the whole product.

The trees do something to the air up here — it is a few degrees cooler and it smells green rather than salty, and the noise of the bay arrives softened. Two single beds, a fan and air conditioning, a hot shower, and a balcony that nobody walks past because nothing is above you.

But it is two minutes down to the water, which is the part people get wrong when they read the word hillside. Therefore you get the quiet without paying for it in distance, and after a hard day in the water the climb is the last useful thing your legs do.