SEASON: 3
SYNOPSIS
Richard and Jonny head underground to explore some of the UK's 400,000 kilometres of sewers. Also, Jonny risks life and limb to discover what it's like to slowly sink in quicksand.
SEASON: 3
Richard and Jonny head underground to explore some of the UK's 400,000 kilometres of sewers. Also, Jonny risks life and limb to discover what it's like to slowly sink in quicksand.
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