Wow! One I like about this show is that you never know who will be next to get killed. You have characters that have been around for maybe 2-3 seasons and then BAM, dead, and your sitting there with your jaw hanging open in shock!
In this epsiode the only thing I don't understand is why is CTU so easily accessible from underground. I'm sure banks are even fortified underground so why is a place that is so sophisticated and classified as CTU so vulnerable from below? And what's up with Nadia? She likes to throw her weight around with people in the office but when it comes down to some danger she cowers. Lead by example! Other then that she is a good character and very pretty.