Since they had an order to carry out an explorative mission in the Shrimp World No. 2, both Atlanteans and Earthlings had some basic understanding of the indigenous tribes on the island. However, the empty descriptions and photos regarding the tribal creatures as those who created large metal ships, mastered the method of manufacturing giant airships, domesticated a variety of exotic animals as their 'tools,' and started creating powerful firearms with the protection of a supernatural god were not enough. All of these became a reality when they finally saw it. They could not help but be struck dumb with fear.