You can use the terminal to deactivate the turret. The end of a the path has an elebator that leads downward into the lower section of the shelter.
After the elevator is a path that goes into a pipe to the right, while straight ahead goes deeper into the shelter. Two more Sentry Turrets guard over a hackable terminal (Advanced) that opens up a security door with reserves of ammo and health items. The doorway in the back of the room leads downstairs into residental room with a lot of junk items and an Ice Cooler with health items.
