Slide down the ramp into the orca tank.
Claim another save/power-up crystal as you enjoy a little dip and some lovely whale song. Don't worry; the playful pair of orcas won't hurt Lara.
Just watch your air meter and head for the hole in the ceiling when you need to breathe. When you're ready to move on, climb out through the hole and up into the room above.
To get back through the laser trap, stand in the doorway facing the moving laser arrays and wait for the lower one to reach the far end of the hallway.
Just as it starts to move back toward you, take a running jump forward and over it.
Run forward and pull up onto the ledge ahead.
Top up Lara's health if necessary and then safety drop from the doorway to the floor, losing about half Lara's health in the fall.
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