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DOOM 3 Hints
Both doors in the Boiler Room are locked! How do I get out?
1 of 4: Have you tried both doors repeatedly?
2 of 4: Have you fully explored the room?
3 of 4: After you finish off the first few attackers, wander around the room until several trites appear and attack.
4 of 4: Right after that, the door to Boiler Room Monitoring will unlock.