When you've taken care of the bad guys, go around to the left side of the upper level (i.e., left relative to the entrance) to the button on the wall.
This button opens a timed trapdoor to the right. You can run all the way around the perimeter and take a running jump through the trapdoor before it closes. But first try this shortcut:
Save the game in case this doesn't work. Then, instead of pressing the button, just stand facing it and hop back, holding Action as though you were going to drop and grab the edge.
Instead of grabbing, Lara should fall back. . .
. . . and land on the floor below.
If it doesn't work, reload and try the timed run as the designers intended:
Press the button.
The trapdoor opens.
Run past the entrance. . .
. . . and on around the perimeter of the room. . .
. . . taking running jumps whenever possible to cover more ground.
On the other side, take a running leap. . .
. . . to sail through the open trapdoor. . .
. . . and land on the level below.
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