在泰国沿海村庄，大批罗兴亚难民淹死在海边。一位青年渔夫在丛林中发现了一个昏迷不醒的男子，他将这个陌生人救回家中。被救的男子一言不发，渔夫给他起名叫通猜。两个男人开始一起生活，并慢慢在彼此之间产生了无言的牵系。渔夫用来吸引蝠鲼（又称“魔鬼鱼”）的闪亮宝石，象征着他们的友情。一天晚上，渔夫登上渔船出海打渔，再也没有回来，留下通猜独自一人。渐渐地，通猜开始接管了渔夫的生活——他的房子、他的工作，以及他的前妻。

Manta rays are one of the most intelligent creatures in the ocean and, at up to seven metres long, one of the largest. Yet despite their size and curious nature, almost nothing is known about their lives. 　　Young marine biologist Andrea Marshall has given up everything for a life in Mozambique, diving amongst these beautiful animals. Superb underwater photography reveals new manta ray behaviour including breathtaking footage of their ritual courtship dances. 　　The film follows Andrea as she studies these endangered animals up close. With the discovery of a giant new species and remarkable insights into mantas' secretive lives, Andrea's findings are already rocking the world of marine biology. 　　蝠鲼是海洋中最珍稀的物种之一。尽管他们体型最大可达7米，世上最大的物种之一，且有着好奇的天性，人类对它们却几乎一无所知。 　　年轻的海洋生物学家安德莉亚，几乎放弃一切，来到莫桑比克研究这种美丽的海洋生物。本片利用水下镜头揭示了蝠鲼的习性，甚至拍到了他们独特的求偶舞。跟随安德莉亚，近距离跟踪拍摄了这一濒临灭绝的生物，发现了巨蝠鲼的存在，并深入了解了它们不为人知的种种习性。安德莉亚的发现，已震惊了整个海洋生物界。