Jump into the water and kill or avoid the shark.

Ahead is a part where you can climb out.
To the left you can find a part where you can use the whip.
Take a running jump and swing to the other side.
Climb onto the narrow ledge and hug the wall.
Walk along.
Climb down on the other side.
Jump over to the next part on the left.
Hug the wall and go around to the other side.
Let go of the wall and climb further along.
Take a running jump over the gap.
Climb up to the top and run up the stairs.
Take a running jump over the huge gap.
Run ahead and kill the two baddies on the stairs.
A third one has been killed by the collapsing ruin.
Pick up the wine coin he has lost.
Then run back up the stairs and jump back into the water.

Dive into the left corner.
There you will meet another shark.
On the ground near an archway you can find more harpoon arrows.
Dive up the archway and climb out onto the stairs.
Run up.
Run outside and to the right.
Take a running jump towards the next platform.
Run further ahead and use the whip to get onto the next part.
Climb up.
At the top you will find some grenades.
Climb down to the water.

Jump in and dive ahead, along the lines of underwater torches. There is a shark you have to avoid or kill. On the left are a couple of archways.

Goodies:
Dive through the first to find a couple of chambers and passages. On the right you will find a skeleton with medikits. Get back outside.

Swim to the end of the waterroom. There turn right. On the right side you will find a damaged wall. You will need a detonation device here. Climb up onto the ruin left of the damaged wall. Climb up to the top and take a running jump towards the next part on the end to the left. Ahead you can see a fire burning. We will come to that later.

Sea Horse Coin

Climb down towards the fire and kill the baddies. You can also throw down grenades to take them out. Collect the harpoons and as many detonation devices as you can carry. Now jump back into the water and swim over the left. Use the detonation device and get out of the way. Return to the damaged wall. Swim into the chamber and collect the sea horse coin.

Trident Coin

Climb back up again and again running jump towards the second part. But don't go down towards the fire this time, unless you need to pick up another detonation device. Instead climb down to the left to reach a platform with a lamp. There turn to face right. The platform with the fire is further to your right. Take a running jump onto the next platform there. Climb up and walk over the tilted column there to get to another damaged wall. Attach a detonation device and then run into another corner of the platform to wait for the explosion. Return to the opening in the wall and step through. Run all the way into the chamber and collect the trident coin on the pedestal. Get back outside.

Jump into the water again and return to the place with the fire where you found the detonation devices. This time, run through the passage there. Turn left and then right. Run past the hole in the floor. If you drop into the water you will have to climb up here again. Find the platform where you can get out of the water.

Waterwell:
Run into the chamber on the right, avoiding the opening in the floor there. At the back wall you can attach another detonation device. Get out of the blast radius and then return to find a well, where you can fill up your waterskin.

Then step out towards the water. On the right side is a rope. Jump towards it and climb up. Remember: Camera buttons for climbing the rope, directional buttons for swinging. Swing over to the walkway behind you and jump to get there. Run towards the right, jump over to the upper part of the bridge. Here you can collect grenades. Run across the bridge and you will encounter three baddies. They might throw grenades at you so be careful. From the watchtower in the corner run out towards the right. At the end you will find more grenades on the left. Then running jump towards the next part. Run to the end and there take a running jump towards the walkway in front of the cave opening.

Kraken Coin

Follow the long path through the cave, till you come out onto a kind of bridge with columns at the end. You could jump over to the other side, but you will need one more item first. Jump into the water and kill the shark. On a broken floor piece by a lamp, guarded by a skeleton you can pick up the kraken coin. Dive to the surface. You can climb out onto the first part of the bridge.

Neptune Gate

Jump across to the gate. You will come to the place where you have to use the four coins. Look at the pictures to figure out where each one has to go.

• Wine goes into the first slot on the left.
• Trident into the second one on the left.
• Seahorse goes into the first one on the right.
• And finally the kraken coin goes into the second slot on the right.

Now use the wheels on both sides, between the columns where you inserted the coins, to turn on the water on both sides. This opens the big gate. Step through.