This exclusive two-parter follows soldiers involved in military tests. Plus: Mariah Carey opens the Winter Olympics! Here’s what to watch this evening This exclusive two-parter follows soldiers involved in military tests. Plus: Mariah Carey opens the Winter Olympics! Here’s what to watch this evening 8pm, Channel 4 What at first seems to be an episode of SAS: Who Dares Wins is actually an exclusive and all-too-real two-part look at Nato soldiers training to defend Europe’s borders against Putin