A gold coin intrigues explorer Dirk (Matthew McConaughey) because the coin is inextricably linked to a treasure legend. Dirk is an adventurous man who can't stop for a moment. He embarks on a tortuous adventure in the Niger River area of West Africa, revealing the secrets of the gold coin. More importantly, he also discovered a major crisis that could endanger humanity and destroy the earth-a dictatorship in Africa colluded with local tycoons to dump a large amount of nuclear materials into the ocean. The local people have been deeply affected and are insane. If they don't act in time, the crisis will expand rapidly. Dirk and female scientist Eva (Penélope Cruz) jointly launched a just struggle. They have to face evil forces and a harsh natural environment, and they are in danger all the way.