New Troop!!

This troop looks like a mole, it would have a hard hat with a light and a pick ax and later lvl it would have double picks.
Properties
when it is placed, it will dig down and under buildings. when it digs under buildings, the support under them will fail and the building will implode into the ground. This doesn't work with walls though. The troop HAS to dig under the 3x3/ 2x2 space for it to fall
The DMS (damage per second) decides how face the unit digs. The higher the lvl the faster it digs.
the troop will be 400 DE?
Defects
-when the building collapses, the troop is exposed and defenses can attack it until it digs under ground again.
- the troop can't destroy TH, AC, or the lab because it is too big to implode.
Undecided Features
- have troops go down the hole as well and come out where fallen building is.
-come out of ground and attack buildings?

OP. WAY too OP. This would destroy the game.