A subterranean ocean on Mars? NASA may well have found...

Liquid water would have been discovered in the basement of Mars, an almost unexpected advance for NASA.

The hypothesis, already raised a few months ago, is coming back in a new study: seismic data acquired by InSight on Mars could suggest the presence of liquid water in the Martian crust, between 10 and 20 kilometers deep. The arguments are getting stronger, even if this idea...