After running onto the breakaway tiles and falling through, take a running jump from the pedestal where you found the shotgun shells over the lava and into the doorway.
Lara will immediately start to slide into a little cave with spikes on the floor. Jump just before the end of the slide to land on the angled block ahead.
Almost immediately jump again to clear the second set of spikes and grab the ledge above.
Pull up, then slide down the angled block on the right to land safely near the grenades.
Pull up onto the tall block next to the slope where you slid into the room.
Climb the stepped blocks.
Grab the horizontal crevice, traverse to the left and pull up onto the ledge. Pull the switch.
This opens the main doors back at the FIRST TEMPLE.
Follow the short passageway to the left of the switch, dive into the water and swim back through either of the underwater tunnels to the TEMPLE ENTRANCE.
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