Don’t watch this terrifying 1,700ft entrance crawl through ‘The Vice’ in a Britain cave if you’re claustrophobic. Sweet Jesus, I panic when I cant get my shirt off my head fast enough!

Birth simulator: Grown Up Edition. At over 28,000m long (17 miles), Ogof y Daren Cilau is one of the greatest cave systems in Britain. It features arguably the most difficult entrance crawl in the UK, and the passages beyond are amongst the most remote and awe-inspiring places in the country.

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Hundreds of eyeballs studying your every move, waiting for the next earth shattering lift! – Only the bravest lifters will dare enter ‘The Cage’!