We see only five per cent of all matter – that's things like galaxies, stars, planets, humans and all other life on earth. The rest is invisible - 25% of our universe is dark matter and a full 70% is dark energy. The nature of dark matter is one of the major questions in modern physics. Dr. Joseph Walding and an international team of Physicists at SNOLAB are searching for the elusive particle. In this RAZOR special Shini Somara travels to Canada where they've built a super sensitive detector 2 kilometres underground in the world's deepest science laboratory.