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.
7. Wait for the rats to come into the room with the steam valve, then open it and cook some rats.