Attenborough explores the planet's undersea habitats, revealing the greatest age of ocean discovery and emphasizing the ocean's vital importance while exposing its problems and highlighting opportunities for marine life recovery.

　　最近发掘的警方录音和第一人称叙述讲述了英国两个杀人狂魔弗雷德·威斯特和罗丝·威斯特的故事。