Machines that Run on Carbonic Acid and the Desert Country

In this country, people and crustaceans live together. A gigantic battery is created based on blueprints left behind in the desert ruins to fight against the revival of biological weapons that have been lying dormant underground after being repelled in the past.

Unbeknownst to them though, when the gigantic battery is finished and started up, the vibration awakens the underground creatures...