《海底大揭秘 第四季》是一部由英国地区于2021年出品的悬疑类综艺。该片由Christopher Riley担任编剧，Yavar Abbas、Steven Clarke、Catrin Evans、Anna Jeffries、Christopher Riley、Adam Warner、Alex West、Chris Thorburn、Tomasz Cebula、Wayne Derrick亲自指导拍摄。主要演员包括凯瑞·莎勒等英国著名影星。
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.Episodes include…1.The Wild West2.The Battle for the Black Swan3.Arctic War4.Hollywood5.The First Americans6.Venice's Lost Empire7.The Mississippi River8.Hurricane Apocalypse9.The Great Barrier Reef10.Sea of Secrets