They want to encapsulate it. No vents to the outside. put heavy duty plastic sheeting everywhere and hook up a dehumdifier. that's the norm these days. But it is so low to the ground they will have dig out some and pull up flooring too. But the musty smells which come up into the house are really awful. Supposed to help filter out radon gas too if there is any down there. Hope this is the last of the big stuff.