13:32The UnexplainersSeries 4Episode 1: Do Mermaids Exist?BBC Radio Wales Duration: 28 minutes Sat 9th Jun 2018, 13:32 on BBC Radio Wales ExtraThe Unexplainers ask the wettest question of all time: Do mermaids exist? Show more GenresFactualScience & NatureComedyChatBrandThe UnexplainersSeriesThe Unexplainers: Series 4 Source: BBC Online