I'm sure you've seen some of these news reports with underpinning where they dug too much at one time and the wall collapsed and damaged a party wall damaging two houses. 

Here is why: a good home inspector will run all waterlines for a good while and put a lot of water down the drains as soon as they get there - if the lateral is clogged or collapsed you will see the result pretty quickly in the basement.

Several very irresponsible city council members and the mayor himself contributed to the collapse of this deal.

I've heard dozens of horror stories from people who lost everything in the last two market collapses.