Now comes a series of underwater levers and doors. You'll need to go back for air between each action so Lara doesn't drown. The UPV can be difficult to maneuver in the tight spaces inside some of the side rooms. It may help to park it outside each tunnel, swim in and pull the lever, then return to the UPV and speed back to the air hole. Here's the sequence:
For this trip, I prefer to leave the UPV behind, but it's up to you. From the air pocket, swim or drive down into the big room...
...turn left, then swim down and forward, through the opening to the left of the entrance (when facing it).
Swim into the tunnel and around the corner to the right...
...to the first lever.
Pull it to open a door in the yellow tunnel.
You can't make it to the yellow tunnel on one breath. So swim back around the corner...
...out into the big room...
...then up to the air pocket, which is in the top left opening on the right wall.
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