Question - How can a set being retired be kept secret?

KShine · 2014-10-04T11:35:05.000Z

There are well over 10,000 LEGO employees, many of which work directly with the production of the sets. How can a set that is retiring possibly be kept secret??? It isn't like they come in to work one day, and are told to melt down the sets, and burn all the boxes. Are the workers kept in isolation, cut off from all communications? Does LEGO use Oompa Loompas?