[ImJustAnotherOkie]

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.

[ryderann]

I’m thinking that this bomb would suck up all of the oxygen in the tunnels and suffocate those who weren’t killed by the blast...the way flame throwers did in the Pacific islands during WWII.

[Hulka]

It is a perpetrator weapon, not air burst.

Media gets it wrong—again.

[rxsid]

"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."

"The GBU-43/B is not a penetrating weapon and is generally intended for use against softer targets in confined spaces such as caves or canyons. In other words—it’s perfect for use against concentrations of insurgent fighters in Afghanistan."
http://nationalinterest.org/blog/the-buzz/super-bomb-why-americas-enemies-fear-the-gbu-43-b-massive-20171

[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.