It's not the first pipe problem I've had. Last time it was a hot water pipe that broke.  I noticed when 1) the house smelled like wet dirt, and 2) there was a hissing coming from under the house (water spraying). This time the house smelled like wet dirt and sewer, so I feared the worst.  Once I got under the house, I was relieved it was only the drain for the kitchen.  So, while stinky, at least it wasn't too gross.