
After obtaining the Gold Dragon in the flooded area, as shown in the last section, follow the passageway to a hole in the floor.

Turn around, hang from the edge, traverse to the left, and let go. Lara will land on a steeply angled heap of dirt and slide down to the floor, without losing any health in the fall.

Follow the wall around to a hole in the floor and drop into an even bigger dirt-filled room below.

In addition to the hole you just dropped through, there are several other openings leading out of this room: a second hole in the ceiling, a large trapdoor in the ceiling, a square doorway high on the wall beyond the trapdoor...

...and a larger, rectangular alcove high on the opposite wall.

Find the movable crate in the left corner below the rectangular alcove. Pull the crate twice.

Then use it to climb into the alcove. Throw the switch...

...to open the trapdoor and dump a lot of dirt from the upper room into the lower one.

Hop down from the alcove. Then climb the dirt pile to the two holes in the ceiling along the left wall. (Ladders painted on the wall show where to go but aren't functional.) Climb onto the flat block below the left hole.

Turn around to face out over the open room. Step to the outer right corner, jump straight up, grab the edge, and pull up through the hole.

In the upper room, climb the dirt pile and pull up through the square hole in the ceiling. This climb is a little tricky due to some uneven and slippery blocks.

These screenshots show one possible path.

...

Throw the switch here to flood a large room elsewhere. (There's no cutscene, but the sound of rushing water plays.)

Drop back down onto the dirt pile, climb/slide down to the other hole, then drop down into the lowest lowest dirt-filled hold.

This time, climb up through the other hole with the painted ladder (i.e., the one on the right when facing the two).

Now you're in the room above the trapdoor. Go around the left side of the dirt pile...

...and climb into the large, rectangular opening near the ceiling.

Flip another switch here...

...to open a door in the room you just flooded.

Carefully climb back down to the lower dirt-filled room. (You can drop through the trapdoor without injury, but only the far side, where the floor below is higher.)

Climb across the dirt pile to stand beneath the open trapdoors. Beyond them is a square opening in the wall. Enter and follow the winding passageway to the end.
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