The Midgard Serpent [15]

Start by climbing on the bike and heading down the tunnel. The lever to the side is not usable yet but will open the gates for your exit.

Treasure 29: Just before the second set of stairs leading down, find a pot on the left corner.

Continue down and jump over two ramps, but brake quickly to avoid falling into the third pit.

Get off the bike, pick up the healthpack, and jump to the pole. Stand on it and use the wall to wall jump to the adjacent pole.

Swing to the ledge on the left. This ledge will slowly lower, raising the first ramp you jumped. Remember this, as you'll need to raise the first ramp again to exit later.

Kill the spiders that crawl up the walls, or quickly get back on your bike and drive to the other side.

In the next area, after the cutscene, kill the spiders. These enemies tend to pounce, so shooting and kicking them at close range is recommended.

Treasure 30: Face the door; there is a pot to the right.

Treasure 31: Use the ledges to the left of the door to climb up to the alcove above the door.

You will encounter seven statues; four are movable, and two are missing staffs. Locate the missing staffs and insert them into the statues' hands. The statues will then pivot, lying across the laps of the other statues.

Grab these staffs and turn the statues 180 degrees to open four doors.

Inside these doors are four trap rooms, each containing a key. Retrieve all four keys.