The COUPP Collaboration uses bubble chambers to search for this elusive signal, and in the summer of 2010 deployed a 4kg bubble chamber 6800' below ground at SNOLAB in Sudbury, Ontario.
 
Dark Matter hub MissionThere is overwhelming evidence that approximately one quarter of the mass density of the Universe consists of an unknown form of Dark Matter. The Dark Matter Hub’s mission is to bring together investigators performing research on all aspects of Dark Matter to fully elucidate the solution to this longstanding cosmological mystery.