[Kenton]

I was wondering how an air burst would work on tunnels, but after seeing the shape of the valley it would qualify as an enclosed area.

It's good for tunnels, because the massive blast will follow all the way into the tunnel seeking unburned oxygen, and the blast sucks all of the oxygen out of the tunnels.

[ImJustAnotherOkie]

I was reading that in fact it is not thermobaric or fuel air but a traditional load of 11,000bs of RDX.