Cloud Drifting

Cloud Drifting (雲流し, Kumo Nagashi) is a prison cloud in which a ship and its crew are sent after they commit a Class-5 crime. The crew stays in this cloud until they all die or the cloud is dissolved. In such a case the ship will fall down from the sky.

In 1322 AOS, the ship called St. Bliss that came from Bliss Kingdom was left on the cloud. The crews had died out but left many things from Skypiea behind.