A team of British and Canadian scientists sets out to follow a single iceberg from birth to disappearance. The story starts at the coastal glaciers of Greenland, where the team watches ice calve off the ice sheet under its own weight, the moment a glacier becomes an iceberg. From there they track the berg out to sea, filming how its shape and hidden underwater mass determine whether it survives storms and shifting currents or breaks apart early. Cameras follow the marine life that gathers around and beneath it, showing the iceberg functioning as a temporary reef and feeding ground rather than an inert block of ice. The scientists take measurements and samples along the way to work out what actually drives an iceberg's slow disintegration, tying the process back to the wider question of how a warming climate is changing the rate at which Greenland's glaciers calve. The film ends where the berg does, melted back into the ocean it came from.