Awful Smell

We were working away, actually it was our second best day ever, anyhow working away and I walked towards the back to get a knife and there was this odor that was terrible.  It came on quite suddenly.  We had no idea what the smell was but thought it was coming through the employee bathroom.  I went down stairs to look at some piping and discovered a rather large pool of water that was backing up in the system.  Twas the source of the stench and it was bad.  A few hours later I was hanging out with a local plumber and was quite relieved when his rather large sewer snake managed to clear the blockage.  The water receeded rather quckly and the awful smell may take a little longer.