Researchers from Niels Bohr Institute, University of Copenhagen, Denmark, studied satellite photographs of Lake Catalina, an ice-dammed lake in East Greenland – and were truly amazed: Unnoticed by science as well as people living in the area, the lake has been the source of four major outburst floods over the last 50 years – each representing an astounding mass of energy, equaling up to 240 Hiroshima-bombs. “The next outburst is certainly building and may happen as soon as 2018-19”, says Aslak Grinsted, head of the research team.