<P> The renewal for a second series was announced on 15 February 2015 . Titled The Tunnel: Sabotage, the series premiered on Canal+ on 7 March 2016, followed by Sky Atlantic on 12 April 2016 (the series was originally scheduled to debut in the UK on 5 April, but was delayed for a week due to the Brussels terrorist attacks on 22 March 2016). Series 2 focuses on the crash of an airliner into the English Channel . </P> <P> The third and final series was announced on 20 January 2017 . The Tunnel: Vengeance consists of six episodes . Series 3 premiered on Sky Atlantic on 14 December 2017, with all episodes released on the same day . The series premiered on Canal+ on 4 June 2018 . </P> <Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="3"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Network </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 10 </Td> <Td_colspan="1"> 16 October 2013 (2013 - 10 - 16) </Td> <Td> 18 December 2013 (2013 - 12 - 18) </Td> <Td> Sky Atlantic </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 8 </Td> <Td_colspan="1"> 7 March 2016 (2016 - 03 - 07) </Td> <Td> 28 March 2016 (2016 - 03 - 28) </Td> <Td> Canal+ </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="2"> 14 December 2017 (2017 - 12 - 14) </Td> <Td> Sky Atlantic </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Series </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="3"> Originally aired </Th> </Tr>

How many episodes of the tunnel series 1