Massive and mysterious habitats, icebergs are dynamic kingdoms that support marine life. As they swing and rotate slowly through polar currents, icebergs fertilize the oceans by carrying nutrients from land that spark blooms of phytoplankton, fundamental to the carbon cycle. During an expedition in Antarctica Peninsula with filmmaker Florian Fisher and freediver Guillaume Nery, we explored and documented the hidden face of this iceberg where crab-eater seals have taken up residence on icebergs that drift at the whim of polar currents.