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

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.

Ray journeys by canoe along the mighty River Thames from Oxfordshire to London, before setting up camp in one of the world's most precious and exclusive woodlands.

In search of the country's largest ground beetle, Ray travels across Dartmoor's granite peaks and into its mysterious oak forests.