Swim across the pool, avoiding the area near the huge underwater fan in the far right corner. If Lara passes the barrels on the bottom, whether she's swimming underwater or on the surface, she'll get sucked into the blades. So either swim underneath the plane or stay close to its tail as you swim along the surface.
On the wall, below the surface, just to the left of the fan is a lever. Approach it from the left, either on the surface...
...or underwater.
Pull it to open the small, square grate to the right of the fan.
To reach it, swim around the barrels, either along the bottom or on the surface.
Then hug the wall as you approach the grate in order to make it past the fan without getting shredded. If you approach along the wall, you'll need to hold the Right direction button as you swim forward along the wall to prevent Lara from being sucked into the fan.
On the surface, swim along the wall and then dive down to the opening. (Yes, that's the Jade Dragon back there behind the fan, but don't try and get it yet.)
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