澳洲的一個鯊魚研究團隊,在跟踪研究一條5米多長大白鯊的時候,突然被深海裡的一種神秘的未知巨獸,一口吞掉,頓時震驚了整個研究團隊,後來他們對這個超級掠食者,展開了長達半年多的追踪和調查,通過追踪器傳回來的數據分析,他們對這只海底巨獸做出了多種不同的猜測,但都無法給出一個合理的解釋,難道在黑暗的大洋底部,真的存在神秘的史前巨獸嗎?
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