The guided tour of Ben Dinh kicks off in a thatched hut, where a map of the region, a cross-section of the tunnels and a black and white movie bristling with national pride fill you in on the background. From there, you head out into the bush, where your guide will point out lethal booby-traps, concealed trap doors and an abandoned tank. There are several models showing how unexploded ordnance was ingeniously converted into lethal mines and traps, and a demonstration of how smoke from underground fires was cleverly dispersed far from its source.

When you reach the shooting range, you have the chance to shoulder an M16 or AK47 and shoot off a few rounds, or stop at the adjacent souvenir and snack stalls. Finally, you get the chance to stoop, crawl and drag yourself through a section of the tunnels about 140 metres long (with frequent escape routes for anyone who can’t hack it). It only takes 10–15 minutes to scramble through, but the pitch blackness and intense humidity can be discomforting, so when you emerge, you’ll be glad you don’t have to live down there for weeks on end as the VC did.

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