Tomb Raider Anniversary: St. Francis'Folly 2

Dive. Find the lever, switch it - the passage to the small room will open. Swim there, climb inside and take Artefact 3/6.

Back to the centre of the chamber, get on the upper level. Receive key of Poseidon.

Artefact 4/6. In the room of Atlas you will shoot at the orb and it runs to you. Escape from the orb and back to the room. Take key of Atlas.

Back to the rift. Climb on the shelves on the right.

Pick up small medipack and Artefact 4/6 and switch the lever. The hole in the floor vanish, so you can back to the Atlas' gate.

Artefact 5/6. You're close to the gate of Atlas. The platform will pull ahead. Overhang from the edge and jump to the ledge below.

Move to the left, jump to the ledge and then leap to the bar. Swing and jump into the niche. Near there is Artefact 5/6. Pick it up.

Back to ledge behind the bar and move down.

Artefact 6/6. You're in the chamber, where you found the key of Damocles. There are many traps, so be careful.

Turn the room round and climb to the niche whit the bar. Switch the lever. Another part of the room will unlock. On the other side of the bar you will see Artefact 6/6.

Back to the former room. Go to Artefact 6/6 , take it and back to the room with the blades.