Hidden 1,000 metres under Mount Ikeno in Japan is a place that looks like a supervillain's dream.
Super-Kamiokande (or "Super-K" as it's sometimes referred to) is a neutrino detector. Neutrinos are sub-atomic particles which travel through space and pass through solid matter as though it were air.
Image: The neutrino detector Super-Kamiokande. Kamioka Observatory, ICRR (Institute for Cosmic Ray Research), The University of Tokyo - https://www.businessinsider.com
