In one of the harshest places on Earth, three women from different generations chase a hidden and ephemeral world beneath the Antarctic sea ice. Dr Natalie Robinson leads a world-first expedition to McMurdo Sound, joined by microbiologist Jacqui Stuart on her first trip south. Mentoring them from afar is veteran sea ice physicist Professor Pat Langhorne.

This documentary exposes Antarctica's dramatic climate shifts, from melting ice to rising seas, showing how changes at the world's edge threaten Earth's shared future.