Jump into the water and swim in the direction of the gear. Move the lever and the bar in the floor will open. Part of wooden platform will appear. Swim to the niche with second stone block and throw it to the water. Go to the niche with the fish - move the block and shade the statue. The level of the water reduce. Go down and close to the stone block, which you have threw to the water earlier. It is near the stone fountain, which looks like fish.
Move the block to shade the fish - the level of the water will reduce again. Go down on the bed of the chamber. Close to the wooden platform, find a bend and clutch the line on it. Move the platform in place, where if the level of the water grows up , the platform won't chock under the bridges. When the water is on the second level, the platform must be between the bar with key and the fish fountain.
Close to the enormous broken part of the flooring, climb up on it. Now you are on the upper level. Go to the stone fish and unlock her mouth. The water will course and fill partially the room. Climb on the column on the centre of the chamber and unlock second fish fountain. Then go to the wooden platform and jump on it. From the platform jump to the niche above you.
Jump to the right on the one and then on the next ledge. Go through the hole above you and take Key of Poseidon. After that switch the lever and open the bar. Go to the fish fountain and block it using the block. Level of the water will reduce. Move down, find exit and leave the chamber. Back to the great sale with gates of the gods.
When you run to the corridor, the platform will appear. Jump from it on the centre of the sale - on the small ledge. Climb up. You will stand on the place above the gate of Ares. Then jump to the open passage.
Go forward. Turn left - there is a gate with bar, which isn't working properly. Do the same what you did in the earlier, identical situation. Then there will be a room with broken flooring and swivel gear. Move the bar round and run on the other side of the chute. Do it quickly.
Look at the three ledges on the left. Jump to them and climb on the shelf above. Take ammo and go to the wall with gear and lever. Move down the lever. Two bars will appear and create a crossbar.
Go to the chamber with Key of Atlas. Take ammo and look around. There are two buttons on the both sides of the statue. Stand on the round statue on the floor and shoot at the first button. Then move and shoot at the second button.
After that the spears will vanish, but unfortunately the orb will fall down and run on to you. Back and run quickly to the chute in the flooring. Jump to the crossbar and from it jump to the other side of the chute. The orb will fall down into the chute.
Turn the bar of the movable gear and run through the flooring to the chamber of Atlas. Go to the small cell and take Key of Atlas. Back to the chute.
Jump to the shelves on the right. Take small first-aid kit and close to the gear with the lever. Move the lever and run through the flooring on the other side of the chute. Back to the great sale with gates of the gods.
The platform will appear before you. Overhang from the edge on the right side of the gate of Atlas and move on the lower ledge. Move to the left. Jump on the next ledge and move down on the another ledge and small stone shelf. Jump to the niche in the next wall. Go to the left as you come to the place exactly above the gallery with gear and lever.