Geothermal Valley - Baths of Kitezh Challenge Tomb (Part 5)

Now swim down under the archway into the room beside the boat. (This is the room to the right of the codex room.)

Swim across to the ledge with the handle. This mechanism is nearly identical to the one in the other room, but this time there is no winch. In order to lower the water level permanently, pull the handle and wait for the water to drain away.

Release the handle. Then quickly, before the water rises, turn around and fire a rope arrow into the spool on the front of the boat, which should still be parked just beyond the archway.

This tethers the boat to the handle, but the water continues to rise.

Either jump across the ledges to the small opening high on the far wall. (There's a container of cloth on the second ledge.) Then drop down into the large room and swim over to the boat.

Or, swim across the room with the handle, wait for the water level to rise, and swim out through the same opening where you came in.

Climb onto the boat and turn the crank to pull the handle, opening the grates and lowering the water level. When you've cranked the wheel as far as it will go, it locks in place, and the water is now completely drained.

Now you can pick up 2 piles of gold coins sitting on the ground in the northeast and southeast alcoves of the main room.

Shoot the jars of Greek fire sitting at the end of the alcove with the codex to blow a hole in the grating. (There are arrows nearby if you need them.)

Enter, pick up another pile of coins, and climb onto the pedestal to read the codex and unlock Iron Grip, a passive skill that increases your axe climbing speed and agility. You'll also receive XP, plus 10,000 Expedition Credits the first time you complete the tomb.

When you're ready to go, exit the codex room and go through the archway ahead on the left. Climb the stairs.

At the top is a document (32/33) sitting on a shelf next to a statue. This is A New Purpose from the Baths of Kitezh series (Greek). Use a rope arrow to pull down the barrier.

Return up the stairs to the Whirlpool Sanctuary Base Camp. If you avoided the swinging spear trap earlier, watch out for it now. From the campsite you can either ride the zip line across the whirlpool and follow the tunnel back to the bear cave in the Geothermal Valley, or use the base camp interface to fast travel to any other camp. Follow the main walkthrough for suggestions.