When you enter the SECOND WAREHOUSE WITH CATWALKS AND GUN TURRETS, save the game in case things go badly or you want to replay this area after unlocking the achievement/trophy.
Before any of the soldiers notice Lara, turn right and vault over the railing.
Lara will lose some health in the fall, but as long as you stay close to the outer wall, the machine guns in the middle of the room won't target her. Run forward, keeping the outer wall close on your right.
Just before you reach the far wall, veer left and run off the edge of the concrete loading dock to land beside the parked tractor-trailer. This truck will shield Lara from the guns.
Move forward alongside the truck and stop near the front wheels.
Top up Lara's health and quick-save.
Then run to the green door ahead on the right and open it before the machine guns shoot Lara to bits.
As long as you didn't alert any of the enemies at the beginning of the level, the "Silent as a Mouse" achievement/trophy should pop as you enter the next room.
Now you can choose whether to reload and complete the previous area for all pickups, or go on from here knowing you've missed one opportunity to get the MAG VEGA. You will have another chance shortly.
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