First thing I did was send several LAFD crews (all with oxygen masks) to the scene, along with two mass casualty units. Sent two LAPD patrols too, just in case we had to keep the civilians back.
The fire crews start putting out the flames and pulling victims out for EMS crews, and a car or two did blow up because I didn't bring enough trucks/crews to cool them, but then the real problem came when the damn tunnel entrance collapsed!!

Luckily, no personnel were hurt, but now I got a smoke-filled tunnel with my fire crews trapped inside (with no paramedics), and the other end of the tunnel, there is no way to get to it from outside except by helicopter. I had called a USCG chopper already, and now the first question I have is: How can I stop that stupid tunnel from collapsing?!! Or do I just send as many fire crews as far in as possible to avoid them getting hurt, and then dig out the debris?
The other question I got is: (fires are all out or almost out at this time) The tips say (in broken English) that the tunnel's ventilation system is defective, and that there is a way to fix it. I thought to myself, "well that explains why none of this smoke is clearing even though the fires are out!" - I tried to lower an engineer from the USCG helicopter to the ventilation fans on the roof of the tunnel, and it wouldn't let me. The only way to get up there is by helicopter, right? He certainly can't climb up the mountain! So if the engineer can't fix the fans from the roof, where are they fixed from?