Again, make two consecutive jumps forward to cross the pipe and jump to the ledge beneath the entrance. Run forward and jump to grab the tall vertical pillar. Climb to the top, tapping the Interact button at the same time to make Lara climb faster.

Once you perch on the pillar, turn right to face the ledge and jump to it. Then sprint to the pillar to the left of the entrance...

... and activate the fourth symbol.

Turn right and sprint back to the ledge you came from. Just before reaching the ledge, release the Sprint button and run to the right side.

Jump to land on top of the tall vertical pillar.

Then jump to the low wall ahead. Lara will grab onto it, so traverse to the left as much as you can (until Lara is hanging from the corner).

Jump to grab the tall vertical pillar behind you and climb to the top.

Once again, jump to the ledge ahead but this time turn right.

If you have made it on time, there should not be any falling waterfall ahead. Use the Grapple to catch the metal ring above and jump forward.

... jump to grab the edge of the alcove. Pull up and get the Relic.