Geothermal Valley - The Physician's Crypt (Part 1)

The entrance to the second Geothermal Valley crypt is at the southeast end of this area. (It will be marked on your map if you found the found the first Explorer Satchel.)

Follow the dark tunnel...

...gathering mushrooms, magnesite on the right and left...

...and a stack of Byzantine coins along the way.

Use your axe to break down the crumbling wall.

Continue along the tunnel...

...to a steep drop-off. Climb down to the ledge below.

Mine some magnesite in the alcove to the left and then slide down the zip line.

There's more magnesite in the wall on the right and a mural (4/4) a little farther along on the left. It is Aurora, The Physician from the Crypt Murals series (Greek).

Just beyond the mural, also on the left side of the tunnel, is a document (13/33), Aurora, The Physician from the Crypts of the Founders series (Greek), plus more magnesite. Use Survival Instinct if you're having trouble spotting them in the dark.

Proceed to the next drop-off and climb down into the cavern.

There's another alcove with magnesite off to the right and mushrooms growing on the left, near the flooded tunnel that leads to the crypt.

Swim through, climb out of the water, and open the sarcophagus to find an ANCIENT BOW PART (4/4). If you've explored the other crypt in the Geothermal Valley and the two in the Soviet Installation, you'll be able to build the bow called GRIM WHISPER next time you stop at a base camp. You also receive 3,000 Expedition Credits.