Scientists have for the first time discovered a cave on the Moon. At least 100m deep, it could be an ideal place for humans to build a permanent base, they say. A group of scientists unearthed a rare discovery about the moon: There's at least one cave and it could house humans. Scientists Leonardo Carrer and Lorenzo Bruzzone from the University of Trento, in Trento, Italy led the study. They join NDTV's Parmeshwar Bawa with all the details.