The Borealis Research Outpost in northern Greenland was used to silence. For most of the year, the only sounds were wind, snow, and the hum of aging equipment. But late one January night, technician Mara Jensen noticed something impossible:
A perfect sequence of radio pulses coming from beneath the ice.
At first, she assumed interference from a passing satellite. But the pulses repeated—sharp, evenly spaced, and originating from the same fixed point below the surface. When she triangulated the source, her confusion deepened.