Trivia: The show was filmed in an actual prison (now unused) in Joliet. The death row cell used for Lincoln Burrows is the actual death row cell that held serial killer John Wayne Gacy.
Trivia: S4E11: (spoiler) The Scylla alarm on the General's computer is visible on screen for a second or two. Below the flashing word 'alarm', it says it is in section AA-23. That's also the designation of the prison block where Princess Leia is being held in Star Wars. This was certainly done intentionally, but is also easy to miss.
Trivia: Paul Adelstein, who plays Paul Kellerman, also guest starred in a season 4 episode of Law and Order SVU in which he played a character named Kellerman.
Trivia: When searching for the driver of the "keyholder" Mahone describes him as in his fifties. When they obtain his ID, it shows he was born in 1980, making him 25.
Answer: Because Miriam was an agent.
But that still doesn't make sense because nobody knew where Scylla was.