In the movie, when one of the people woke up from the Matrix - or died - they were flushed into the old sewer system. The water there should have been full of r

In the movie, when one of the people woke up from the Matrix - or died - they were flushed into the old sewer system. The water there should have been full of rotting corpses, yet the ship easily navigated through what appeared to be clear water.