Suisei no Gargantia

Synopsis

Deciding to try and open a dialogue with these people, Ledo stays pinned to the pylon. He asked the crew to talk to the Alliance in charge, but the crew have no idea what he is talking about and they believe that Chamber, who is translating, has another person inside. As Ridget, the commander, and the crew try to decide what to do, Amy gives Ledo food and begins talking. She explains that this is Earth, and when it was frozen over, some humans escaped to the stars while others stayed. Eventually, the ice melted and became a vast ocean, in which many people form fleets to salvage old technology from below. Looking for other items of advanced technology, Ridget sends Bellows to the point where Chamber and Ledo were found, and Bellows' ship is attacked by pirates. Amy asks Ledo to help them, and he agrees with the intention of earning their trust. Ledo boards Chamber and efficiently kill the pirates with no harm to Bellows' ship and crew, as Amy and the others watch in shock at its destructive power.

(Source: Wikipedia)