Crispin Sadler is a specialist factual producer with a passion for marine archaeology. In 2002 he formed a partnership with a childhood friend, Simon Mallinson, and Mallinson Sadler Productions was born in 2002.

The first ‘Drain’ show, ‘Drain the Great Lakes’ was pitched to national Geographic in 2009, went into production in 2010 and delivered in 2011. After that came five more shows on an annual basis until 2018 when the first series of 10 x 47’00” episodes were made. This year, 2019, 15 episodes are being made with Series 3 planned for 2020.