That is always a possibility when dealing with governmental and supposedly secret yet outside the government officially organisations.
Oh, sorry. Getting ahead of myself. Rift through space and time - ran through Cardiff in the alternate world / fictional reality that I came from. We wer able to 'open' and 'close' it, but even when closed, things still came through the Rift willy-nilly. When open, well, nearly destroyed the world.
Ianto Harkness-Jones, by the way. At your service.