Glacial Cavern - Ice Ship Challenge Tomb (Part 3)

At the top of the ice wall, jump up to grab the lower of the two oars embedded in the ice. Jump again to grab the higher oar, and then press Interact for a saving grab. Climb to the right and jump to grab onto the embedded beam.

Continue climbing to the right until you can pull up onto a small ledge. Then scramble up the wall onto the wide ledge above.

Collect 2 Byzantine coins lying on the ground. (It looks like about 20, but trust me even Lara is not so lucky.)

Move forward to find more treasure. There's a lot of stuff you can't take, plus a jar with some herbs inside, 2 bunches of arrows, and a document (3/4), The Captain's Revenge from the Glacial Cavern series. Examine it for XP and Greek language skill. There's also an Archivist Map on the table to the right. Examining it reveals the locations of any unfound relics and documents on your map. (It says murals rather than documents, but there are no murals in this level.)

Finally, go up the steps and examine the codex titled Ancient Abilities. Doing so unlocks a special skill without having to spend any points. By reading this book, Lara learns a Byzantine technique that allows her to "Quickly shoot up to two successive arrows without the delay of redrawing from the quiver. Rapid fire arrows by quickly pressing and releasing RT after an arrow is first shot."

Codices are technically documents, though they are not marked as such on your map or counted as documents in the total for the level. However, if you want to learn more Byzantine lore, look for Ancient Abilities in the Codices section of the Documents screen in your inventory.

When you're ready to move on, turn around and go to the left side of the ledge overlooking the chasm.

Slide down the rope line, drop onto the icy slope, and slide into the tunnel below.