An entire sea vanished — then came back in under two years, in the largest flood the planet has ever seen. This is the Messinian Salinity Crisis and the Zanclean megaflood, told from the salt on the seafloor up. Around 5.97 million years ago the Mediterranean was cut off from the Atlantic. Under a brutal sun it evaporated faster than its rivers could refill it, dropping as much as two kilometres and losing up to 80% of its water.

The 1700 Cascadia earthquake and tsunami was a massive natural disaster that reshaped the Pacific Northwest. Through tree rings, soil layers, and international collaboration, scientists have pieced together the exact timing of the event. As the region braces for another quake, can we prepare in time? Find out how new models and tsunami evacuation towers are helping coastal communities face the threat.