b'UNDERGROUND WORLDSThis series takes you behind the redbeauty, this is a voyage of underground rope of the tourist trail and into somediscovery. Its not all about the past Historyawesome and epic underground spaces.though, many locations have new uses, Whether theyre man made or formedlike a Welsh slate mine now home to a by mother nature, these subterraneangiant trampoline attraction, or a WWII air worlds all have stories to tell andaid shelter now housing an urban farm. secrets to share. Ancient hideouts, WWIIWe also join the passionate experts who tunnels, hidden cold war bunkers andare still digging and searching for new mind-blowing caves of stunning naturaldiscoveries these worlds have to reveal.NEW Duration: 10 x 60 Producer: Phoenix Films Year of production: 201942'