You are Earth's last hope!
Entrusted with the most advanced submarines, your mission is to defend humanity against swarms of alien monsters emerged from the oceans.
Shower the enemies with rains of bullets while dodging their vicious attacks with your masterful maneuvers. Recover treasured technology from the lost civilization of Atlantis to power up your fleet. Discover the terrifying truth that is kept in the depth of Earth’s ocean while enjoying the colorful sceneries of the seven seas.