
The door to the right is locked, so climb up the convenient stairs the pipes in the corner provide to access a vent shaft. After killing them, grab the shotgun ammo and smash the crates at the far end of the room for two batteries.

Crouch under the pipes to continue to a room with a headcrab and two vortigaunts. The door on the left is locked, so just time your passage right to get through the steam without damage.

After you go down the hallway a bit, you'll come to a leaking steam vent.
