Undertakers, or Trashsweepers, are a form of intelligent bio-weapon produced by Umbrella by 1998. Their purpose, rather than a product for sale, was to serve Umbrella HQ in countering biohazards and destroying incriminating evidence.
The Undertakers were developed by Umbrella as a dedicated anti-biohazard force. While Col. Sergei Vladimir's Umbrella Biohazard Countermeasure Service relied upon trained human operators, the Undertaker Unit's use of cloned, intelligent B.O.W.s made them replaceable and thus more appropriate for high risk missions such as "A+ Class". Undertakers were themselves led by a human operator, a B.O.W. trainer who they would acknowledge orders from, and were trained in firearms, of which the MP5 was standard-issue for their unit. The secondary mission for Undertakers was the elimination of incriminating evidence and witnesses, and if needed this included all humans not their squad leader - including Umbrella executives. As an additional layer of evidence destruction, Undertakers were designed to dissolve when killed. Upon completion of a mission, Undertakers were also expected to be killed rather than be picked up.[excerpt 1]