Web UI SpinnerCoach TripMy List Outline IconAdd to My ListShare IOS IconShareS06:E04 - SierreFilmRiseReality · 2005 · 26 min · 13 SeasonsTV-14Subtitles IconThe tour leaves the Swiss mountains behind and heads to a huge underground lake.EpisodesDetailsSeason 6Arrowhead Down IconSeason 1Season 2Season 3Season 4Season 5Season 6Season 7Season 8Season 9Season 10Season 11Season 12Season 13Play IconS06:E04 - Sierre26 minTV-14The tour leaves the Swiss mountains behind and heads to a huge underground lake.CastBrendan SheerinDirectorFederico RuizGenresRealitySubtitlesEnglishTV-14This program contains material that many parents would find unsuitable for children under 14 years of age.