Quadrillions of invasive quagga mussels are re-engineering North America’s Great Lakes at a rate not seen since the melting of the glaciers.

These nutrient-hungry mussels are leaving uninhabitable, crystal-clear waters in their wake, while the scientific community is racing against time to stop them.

Shot over 150 days using cutting-edge underwater drones, this eye-popping exploration of our freshwater world is the definitive account of the Great Lakes in the 21st Century, and showcases freshwater wildlife and environments like never before.