Description of the Gaddafi bunker

UPDATE from Joe @ 8:18 PM: Matthew Chance, CNN's reporter in Tripoli, just reported that Saif al-Islam Gaddafi was not captured after all. He showed up at the Rixos hotel a short time ago. Chance talked to him.
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Wikipedia has a pretty good map of the situation in Tripoli. At this point Gaddafi controls only a few square miles of territory.

Click image to see larger version

But that may not be the whole story. According to the London Telegraph Gaddafi has a network of tunnels under Tripoli.

One of the reasons we know about the tunnels is that Gaddafi managed to appear for a press conference at the Rixos hotel without any motorcade or surface transit. The Rixos hotel is where 40 international journalists are being held by Gaddafi troops.