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Brushing up on...

Series 1

Episode 1: British Tunnels

Duration: 30 minutes

on BBC Four HD

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

BBC Four HD

About BBC Four

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.