Aerospace

1. For temporary relief, leave by the way you came, then gather your wits.
2. For a permanent solution, kill or scare them off.
3. There are hundreds of rats, killing one at a time is certain death.
4. Explore the tunnel carefully, maybe there's something that can help.
5. There's a steam valve in one of the Steam Tunnel rooms.
6. Scalded rats would probably be either scared or dead.