World's Only Moving Mud Puddle

I don't get it. Why not go past the structures on the surface you want to save say 1/4 mile - drill straight down till you hit a gas pocket and keep venting there then build a support along the road and railroad you want to support.  then near the vent start digging a huge 100 ft wide pit till you find ground water and "steal" the gas powering the moving mud puddle essentially jumping Under the man made structures you want to save? Like underground checkers.