An underground lab is opening early next year in Australia. Its quest: to help detect dark matter and thereby also help answer some of physics' biggest questions about this mysterious force. It is the only detector of its kind in the Southern Hemisphere. Swinburne University astronomer Alan Duffy takes us on a journey to the bottom of this active gold mine, where researchers will try to detect a ghost-like particle.E-mail us with your deep questions at ShortWave@npr.org.