The ridiculous AI slop image of troops posing around a TBM that's apparently just dug a tunnel several multiples its own diameter is a good illustration of how clueless the author is about tunneling. TBMs are hugely complicated and expensive machines, need vast amounts of materials and the associated logistics network to operate, and drill 200 to 700 meters per week depending on the terrain. Deploying and operating one in battlefield conditions is absurd, all the enemy needs to do is fly a suicide drone into the open end of the tunnel and now you have a multi-hundred-million-dollar paperweight.

I don't think that the prospect of getting hit under battlefield conditions is the problem here because that's always the problem and the tunnel is supposed to be the thing that helps you avoid getting hit. Tunneling under battlefield conditions has also been a thing in military conquest of castles for a very long time. These days you don't really have to tunnel towards an enemy, you just have to create underground spaces for your missiles, aircraft, etc. and as safer bases so the situation is vastly easier.