Look for [RIFLE AMMO x4], [HANDGUN AMMO] and [SHOTGUN SHELLS x2] in this hall, as well as [RELIC - #1 VASES (KANSU BURIAL URN)] on a table. The 'Sacred Hall' base camp is also located here. Look for [DOCUMENT - #6 WARTIME INTELLIGENCE (SOLDIER: LAST STAND)] near the double doors. Open the doors and take a deep breath to sniff up the aroma as you enter this bloody hall. Move to the left side of the area to find [DOCUMENT - #7 ENDURANCE OFFICERS (WHITMAN: CROSSING THE LINE)]. Ignore the wheels for now and head up the second floor walkway to find a [LARGE SALVAGE] crate and the complete [TREASURE MAP] of this area.
Chasm Shrine collectibles + puzzle.
[RELIC - #2 VASES (BAN CHIANG VASE)] can be found in the corner of the ground floor. To continue, turn the wheel on the right first, followed by the wheel to the left to raise the cage. Pull the cage back with a rope arrow to smash the wall above the gate. After this, turn the wheel on the right again and drop the cage on the ground by turning the left wheel one last time. Now head up to the second floor and face the cage (and gate). Pull the cage towards you with a rope arrow, leap on top of it, then jump over to the crack to reach the next hall. You can find [DOCUMENT - #10 ANCIENT SCROLLS (HOSHI: AN END)] on the south part of this circular room.
Make your way through the hall to find [SALVAGE x2] and you'll reach the point of no return; this is the last fast travel camp in the game. You can find the [RELIC - #3 VASES (SATSUMA VASE)] nearby. When you're ready, open the double doors to enter the next area.
NOTE: Even though this is the "point of no return", meaning you can't fast travel back to any of the other areas, you can still continue after
Move over the bridge to trigger a scene. Move left to find an [XP BOX], then shoot a rope arrow in the wall to reach the upper walkway soon enough. Climb the ice wall outside, then stand on the left side of the wall and pull the object towards you; the wind smashes it into the doors, clearing the way.
Proceed left and climb the platform. Create a rope bridge to the top (shoot it in the only object with rope around it, far up ahead). As you ascend, quickly get a good grip as Lara falls down to a lower beam. Climb this and leap over to a walkway in the distance. Make your way over this walkway; as you approach the ice wall, be sure to quickly sling your axe into it as Lara drops down. Perform a double jump to reach the window; climb over it and head inside. Use a rope arrow to reach the ice wall in the distance; it can be a bit tricky to spot, but it's slightly higher than Lara's current position (and wait for the thunder to strike to mountain first).
From here, make your way the left and leap to the ice wall on the left side. Drop down from here and quickly slice your axe into the ice wall directly below you. You can now move around the mountain via the right side to reach another walkway.