After retrieving the fifth red skull, as shown in the previous section, climb down and stand on the square pressure pad to receive a message about a new minor Objective: Bomb Free the Four Frozen Gears. This isn't much of a challenge since the text tells you what you need to do, but in any case, start with the giant gear (1/4) to the right of the pressure pad. Either detonate a remote bomb near it or just melt the ice with the flamethrower.
In the co-op game there are 2 pressure pads, but otherwise things work the same way.
After thawing the first gear, near the pressure pad(s), hop down off the ledge and head to the right...
...to find the next giant gear (2/4). Destroy the ice around it with the flamethrower or a remote bomb. Move downscreen...
...and climb down onto the next giant gear (3/4), just to the right of the Challenge Tomb entrance. Drop a remote bomb on or near the gear and get out of the way before blowing it up to free the gear.
Use the column with Osiris's glyphs to climb onto the ledge on the left near the wooden scaffolding.
Destroy the last giant gear (4/4) to open the Tomb of the Architect.
Return to the northeast corner of this area and enter the tomb.
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