This passage has a some springboards which must be done in a certain
sequence. Stand with your back to the first and do a backflip onto it to
launch up to the rest of the springboards. When the ride is over you need
to kill another Eagle before jumping and pulling up to the ledge in front
of you. The doors should be open so enter.

Continue until you can jump to the square ledge near the lock. Jump to the
left box then quickly climb up the ladder as the spiked wall closes in.
Drop down to the ledge on the right then start running and jump from the
ledge over to the ladder and climb up to avoid another spiked wall.
Continue until you find a switch which opens one of the gratings you walked
past only moments ago. Return to the opening to see the Main Chamber Key
resting on top of a pillar. Get the key then begin a somewhat fun slide
down the curving slope around this pillar to the floor.

Continue on to end up on a pillar near the door you opened with the button
earlier. Jump over to the lock and use the key which will raise a metal
grating next to a pillar. Turn and do a running jump and grab and pull up
to go in that direction. Climb the ladder and exit towards the spikes on
the right. Jump over the spikes and keep climbing the ladder and ignore the
switch on the right. You should now be back in the area where you found the
Main Chamber Key. A second grating is now open and there is a second and
taller pillar you need to reach, so go through the open grate and head left
to do a running jump and grab and pull up to get on the ledge. You'll reach
a slope that sends you sliding toward the pillar with the serpent so jump
as you begin to slide to reach the pillar. After a short slide down the
serpent you will reach a flat area next to a ladder.

Climb the ladder until you reach the blade then do a jump back to the
sloped surface then forward again to regain another ladder above the blade.
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