Proposed by DOSI as an official UN Ocean Decade Programme, Challenger 150 is a new 10 year deep-sea science programme which follows in the wake of the Census of Marine Life. Working closely with global partners, including REV Ocean and the Schmidt Ocean Institute, Challenger 150 aims to deliver ‘the deep ocean we want’ as part of the UN Decade of Ocean Science for Sustainable Development. This webinar which took place in February 202 introduced the programme and set out initial steps.