Martha Holmes / Cameraman Doug Allan prepares to film swimming polar bear from boat. On location for BBC Polar Bear programme 1996

Rob Jordan / 2020VISION / 2020VISION photographer Linda Pitkin working with her husband Brian Pitkin photographing Brown trout (Salmo trutta) and Atlantic salmon (Salmo salar) with an underwater polecam, River Tweed, Cheviot H...

Rob Jordan / 2020VISION / 2020VISION photographer Linda Pitkin photographing Brown trout (Salmo trutta) and Atlantic salmon (Salmo salar) using an underwater polecam, River Tweed, Cheviot Hills, Northumberland, England, UK, Oc...

TOM WALMSLEY / Camerman Peter Scoones filming grey whale underwater with remote camera, San Ignacio lagoon, Baja California, Mexico

Doug Allan / Andrew Taqtu Inuit field assistant with remote camera Canadian arctic Lancaster sound