The new submarine flotilla is the pride of the Japanese Navy. The maiden voyage of the newest boat not only attracts the attention of the Imperial family yet is at the same time a test for the selected crew. But shortly after departure, something mysterious happens: The submarine seems to sink and all crew members lose consciousness. When they awaken, they realize with horror that their boat has left its element. It rests on the top of a gigantic tomb for the King of Mutal, lord of the largest metropolis of the Maya, in the middle of the Central American mainland, some 1500 years in the past. The confused crew goes straight into war and faces the crucial question of where their path will lead them now – to an empire or straight into disaster?