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Brushing up on...

Series 1

Episode 1: British Tunnels

Duration: 30 minutes

on BBC Four

Danny Baker considers some tunnel-based archive footage and endeavours to give a quick brush up on these mysterious, subterranean realms.

BBC Four

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BBC Four reflects arts, music and culture with an ambitious range of intellectually and culturally enriching programmes, taking an expert and in-depth approach to its subjects.