Alex can already hear the increased sound of helicopters as Blackwatch reacts to the absence of Dana at the hospital. "They already know something is going on. Maybe it's better to do a frontal assault. The tunnels are easier to block, but they're more protected from air support. A helicopter would be easy to shoot down, and if we land in the water, I could be in trouble. Attacking one of the bridges might be the best option." But he's also pretty sure that they're rigged with explosives, to blow out the bridges if it looks like he's going to get away.