I don't think that the MOAB killed anyone.

[Jehanne]

It just does not make sense from a physics POV:

http://www.cnn.com/2017/04/14/asia/afgha...index.html

Besides, how does anyone really know?  Kind of seems like US propaganda here?  Besides, did anyone go into the militant tunnels to count the dead remains?

how do the "physics not make sense?"

Are you say the concept of a air dropped bomb is not possible? or are you say if one scales this bomb principle up to 21,000 tons the bomb does not work?

The physics does not make sense because a bomb converts energy (chemical or nuclear) from one form to another (electromagnetic or light or mechanical), which results in thermal energy (heat) and, especially, a mechanical wave (supersonic), which manifests itself as sound (and, especially, pressure).  And, so, a bomb creates a huge pressure gradient as it travels away from its explosion at first supersonic, and then, subsonic, speeds in all directions.  But, if something (say, a tunnel) is sufficiently far underground (say, 30 to 60 feet), then the pressure from the bomb (which is Force / Area) will only exert a small influence on the tunnel, which after all, is supporting a far greater force (namely, the weight of the earth above it, W = mass of that section of the Earth * g, the gravitational acceleration), which means that most of the force from the blast will be going laterally (which will obliterate any nearby buildings, persons, etc., due to overpressure) and vertically.  Any mechanical waves (via the atmosphere) will hit the ground and be reflected back upwards into the atmosphere.

And, so, if the tunnels that ISIS had were deep (say, as deep as what the Mexican drug cartels are building -- say, 30 to 60 feet deep), then they were completely unscathed by an above-ground explosion.

P.S. I should add that the news reports said that the bomb was a mid-air explosion that did not detonate upon impact with the ground.