Agent, this is Subject 2. The key you found at the Sewer Laboratory had certain DNA located on the handle. We've tracked the person down. His name is Proffesor C. Turnoille. We don't know much about him yet, apart from the fact he built a machine to do what looks like processing the Sewer water into something. This can't be good. Defeat the guard in the west corridor. You'll probably need the key. Good luck, Agent.