The underground tunnels have definitely been shown on television, and the rebels are well aware of them. There was talk about one probably going to the airport. I was watching Al Jazeera English at another house, and the rebels are definited trying to pacify Sirte and Sebha (sp?), two cities with strong Gaddafi ties. I also saw somewhere, and may have already posted a link, that a Gaddafi supporting tribe in Tunisia has been bombarding nearby cities that the rebels have claimed.
Meanwhile here is other new information: I think this article is about prisoners released in Tripoli, but fears for the fate of 50,000 that are unaccounted for yet. (I had to run out for the day before transfering this link from where I had cached it and my memory used to be better.)
http://news.xinhuanet.com/english2010/world/2011-08/29/c_131080159.htm
And here is a story about Libyans demonstrating in Zimbabwe, another country whose people have every reason to want to throw out its dictator.
http://www.voanews.com/english/news/africa/Anti-Gadhafi-Libyans-Demonstrate-in-Harare—128401538.html