ok.... I've got the key of Hephaestus and the key of Poseidon, I am in the area to get a third key I think... you enter the room and there is a Pulley you have to turn to move the floor together then you run and jump over the floor before it opens.... now in a long tunnel/ramp with a globe on top and many spears below it... I climbed the left side of the tunnel using the ledges and pulled the switch which put poles over the gap where the floor was so you can jump back over.... now across the tunnel is another switch but I cannot get to it!! If I try to jump across from 1st switch...cannot reach I do not see any grapple hook to swing across.... help...thanks

ok I found this answer on the web


Drop back down and go to the top of the ramp. Be careful, because the spikes are harmful. Enable the Manual Aim and shoot the two buttons alongside Atlas' statue. Every time you shoot a button, the camera shows a row of spikes to be removed. After the second shot, Atlas' globe will fall down, so immediately run down the ramp. Keep running until you reach the pit. Jump to grab the pole, but do not swing because the globe will hit you. Once you grab the pole, quickly press the Jump button to land on the other side. The globe will destroy the pole and fall into the pit.

Use the mechanism again to extend the stone platforms and make it across. Go to the top of the ramp and pick up the Shotgun Ammo. Enter the alcove and get the Key of Atlas from the pedestal. Go down the ramp and use the now broken pillar on the left to reach the ledge above. Pick up the Small Medipack.

Artifact #4 - Climb on the ledge to the left and pick up the Artifact.

Drop back down and use the switch to extend the stone platforms above the pit. They will start opening again, so drop to the ground and cross the pit. Go through the passage, use the switch and jump to grab the handhold of the door. Once it opens, jump to grab the pole behind you. The door will close, so swing and jump to grab the opening above the door. Drop down at the other side and return back to the room with the central structure. [Checkpoint] On your return, a ledge extends, so you can reach the central structure

I havent got there yet... is it far in the game?