The first season of eight episodes produced by Electric Pictures premiered on 15 September 2016. In March 2017 the series was renewed for a 10 episode second season, which premiered on 6 July 2017. In March 2018 the series was renewed for a 13 episode third season, which premiered on 31 May 2018. In September 2018 the series was renewed for a 13 episode fourth season, which premiered on 2 May 2019. In October 2019 the series was renewed for 40 episodes across two seasons. The 20 episode fifth season premiered on 30 April 2020. Following the conclusion of the fifth season, three specials featuring highlights from the five seasons premiered on 17 September 2020. The sixth season initially premiered in the United Kingdom on
Discovery+ on 22 February 2021 before premiering in Australia on Discovery Channel on 29 April 2021. In April 2021 it was announced the series had been renewed for a seventh and eighth season. In August 2022, Warner Bros Discovery UK announced the series was renewed for an additional two series, with the eighth and ninth seasons to premiere in 2023 and 2024 respectively. The eighth season will see the return of six teams and the addition of two new teams. == Cast ==