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Two gritty teams of hobbyist cavers attempt to break records for the longest and deepest caves in Canada.

Ray journeys to the magnificent Isle of Skye in search of Britain's rarest bird of prey, the spectacular sea eagle.

Ray uses the Derwent River as his guide to the breathtaking Borrowdale valley, a place of ancient rainforests and home to some very special wildlife, including peregrine falcons.

Ray visits Galloway, exploring the riches of the stunning coast of southwest Scotland and the hidden treasures that live in Britain's largest forest park - including the rare and elusive pine marten.

Ray explores the wildlife surviving against all odds in the rugged landscapes around Britain's highest mountain range, Snowdonia.