Hidden Wales with Will Millard

 We’re more used to seeing Millard sailing the South Seas or stalking the jungles of Papua New Guinea, so it’s odd to find the explorer fetching up in the rather less exotic location of Wales. Here, he goes in search of “natural wonders, forgotten buildings and modern marvels”. This week, he dives off the coast of Rhyl in search of the submerged wreck of one of the world’s first submarines.