Cruises are like floating piles of sewerage that you pay to ride for a week. But sometimes cruises need to release a bit of that sewerage so that the ship doesn't sink. Dumping of bilge water is tightly regulated when cruises are near populated areas. But Princess Cruises, owned by Carnival Corp, just spent a decade illegally releasing that garbage into the ocean. Today, the US Department of Justice announced that it reached a $US40 million ($54 million) settlement with the company over its illegal dumping and efforts to cover it up.