You notice the incendiary bombs dropped on the tunnels.
If all you wanted to do is to collapse a tunnel, an explosive is used but it wouldn't produce a huge fireball.
If you wanted to suck all the oxygen out of a tunnel complex, suffocating everyone inside the tunnel system by removing breathing air... then use incendiary bombs.
For every section of tunnel destroyed... there may be many more that are intact, but have dead Hamas militants that couldn't escape and had no ability to breathe.
You notice the incendiary bombs dropped on the tunnels.
If all you wanted to do is to collapse a tunnel, an explosive is used but it wouldn't produce a huge fireball.
If you wanted to suck all the oxygen out of a tunnel complex, suffocating everyone inside the tunnel system by removing breathing air... then use incendiary bombs.
For every section of tunnel destroyed... there may be many more that are intact, but have dead Hamas militants that couldn't escape and had no ability to breathe.