电影记录了詹姆斯·卡梅隆驾驶单人深潜器“深海挑战者”号成功下潜至世界海洋的最深处――马里亚纳海沟的全过程。卡梅隆下潜的深度是35756英尺（约合10898米）——是全世界海洋无可比拟的深度极限。在这部纪录电影中，也讲述了研发深潜器背后的故事。在万米海底，卡梅隆停留了六个小时，用高清3D摄影机拍摄下来，而他为这次下潜热身的其他十几次潜水也将被剪进这部90分钟的3D纪录片里。DEEPSEA CHALLENGE 3D follows the dramatic story of James Cameron's odyssey as he undertakes an expedition to the deepest part of the ocean. This is a journey of historic proportion and risk. The film will mesmerize viewers of all ages with the thrill of true discovery and the allure of the unknown, of new life forms, and of vistas never before captured on camera - all right here on planet Earth.