Run!
A scene begins. When you regain control, tear out of the Archives before the attackers can stop you. This section is intuitive enough that you can likely do it without any assistance. However, here are the instructions for completing the evacuation in case you run into any trouble!
» Run up the fallen statue, using it as a ramp
» Veer left at the top of the ramp.
» Run up the stairs and pull yourself to the upper landing.
» Jump up, onto handholds along the wooden wall, to your right.
» Climb to the top of that wall.
» Jump and grapple across and large gap, aiming toward another wooden wall.
» Quickly scramble up that wall when you land, and get to the top of it.
» Run along the wooden walkway where you land, and jump across a small gap.
» Jump and grapple over a much larger gap and then smash through a burning wall.
» Run and jump over to a beam of wood.
» Pull yourself up and walk to the right.
» Jump up the wall onto a climbable area, and keep scrambling up as high as you can go.
» At the top, jump left, onto another walkway.
» Run to the end of the walkway, jump, and grapple onto a hanging container.
» Climb onto that box, jump onto a wooden beam, and leap right to catch another set of handholds.
» Climb to the top of the Archives.
» Swing to another platform, and sprint forward.
» Rush past the exploding urns of Greek Fire, jump over a gap, and slide down into the water below.
Return to the Valley
Swim out of the submerged cavern. You breathe without trouble now, thanks to your Rebreather, so this is easy stuff. Go through a couple of sunken areas, and climb up to solid ground at the end of the route. You’re going to miss some collecting here, but you have to come back later with more tools.
On the way out, you find a Strongbox and a Mural. The route is linear, so you won’t have any trouble seeing them.
Just before you break out of the cave, a call comes in over the radio. Climb a rockface and go back into the Geothermal Valley. It’s good to see the sun again.