On your way in a Riotguard to Tower 19, you should come across a Briefing room. Shoot the guards inside, then when the coast is clear exit the Riotguard so you can enter the Briefing room. Look to the right to see a black and white photo credit of all...
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In the "Showers" area, there is a room with 6 doors with name tags on them. 4 of them have the names "Carey", "Chancelor", "Keenan" and "Jones". These are the last names of all 4 members of the band Tool (Danny Carey, Justin Chancelor, Maynard James Keenan...
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