Need to create a 3D environment

My final is to create a 3D space in UDK. I have never used UDK and my professor sprung this upon us and claimed we could learn on our own. He also said that we don’t have enough time to model anything on our own (in Maya or Blender), and we don’t. He said that UDK would have models/existing assets we could use, but I’m not sure I believe him.

Does anyone know about any sort of models/assets built into UDK that can be used to create a 3D space?