Demo mines in SB WW1

[Embis]

Hi,
Does anyone know where these are discussed in the manual?

They have a range zero, so my men need to sit on top of them to detonate them, and then, when they do detonate..... everything in an impressively wide radius is wiped out...except for my men who were sitting on top of the explosives and are completely unhurt??

Presumably these represent the massive trench mines used in WW1, having the men sit on top of the explosives to detonate them seems a little odd, even more odd is that they, at the epicentre of this massive blast, survive unscathed!

Wouldnt it be more realistic to have them detonated from a much longer range?

or am I missing something here?

( incidentally, my great grandfather, as a former coal miner, was involved in placing some of these so I have particular interest in them!)