When you reach "Pigsville" (the guards quarters) after meeting Pope Joe, continue through the shower area. Once you leave it and step into the first corridor, turn right and go into the doorway at the end of the hall. These are the guards individual quarters. Go to the first room on the right (the nameplate will read "Keenan") and ring the doorbell. You'll hear mostly gibberish but also a mention of "Vatar." Vatar was the main villain of Enclave, another game made by Starbreeze (who are the developers of Escape from Butcher Bay), and the voice is that of the goblin character, a low-ranking enemy in Vatar's forces.