Do it yourself

My husband is in the bathroom pounding away as I write this. We're redoing a bathroom, ripping everything out down to the studs. Expected to find plaster and lath behind a ceramic tiled wall (tiled to roughly 18" below ceiling). Instead only found the p/l above the tile. The tile is set into a thick (2-3") bed of concrete set into a wire mesh. Sawzall does not saw all. Ruined a few blades. Don't want to sledghammer b/c rest of house will crack. Prybar on studs is bending studs rather than pulling down concrete that thick. Advice? What about a diamond blade on a circular saw? Thanks, Samantha