《海底大揭秘第四季》 是Yavar Abbas,Steven Clarke,Catrin Evans,Anna Jeffries,Christopher Riley,Adam Warner,Alex West,Chris Thorburn,Tomasz Cebula,Wayne Derrick导演的作品，发行于2021年（英国），由凯瑞·莎勒等主演的一部记录片。
讲述了：　　Combining undersea exploration with innovative visualizations, DRAIN THE OCEANS reveals hidden evidence of amazing undersea mysteries.　　Not “artists impressions” but what is actually there — down to the very last rivet. And, for its fourth season, it embraces a gripping new style, telling stories purely through the words of explorers and archaeologists, putting viewers right by their side.