Patent ID: 8136470
Filing Date: 2012-03-20
Classification: B63G

Abstract:
1. A system comprising: a first containment chamber disposed within a tethered object, the first containment chamber having a fixed housing; a second containment chamber at least partially enclosed within the first containment chamber, the second containment chamber configured to expand and contract within the first containment chamber; a first fluid supply, external to the tethered object, having a first fluid disposed therein and connected to the first containment chamber by a first fluid connection device; a second fluid supply, external to the tethered object, having a second fluid disposed therein and connected to the second containment chamber by a second fluid connection device, wherein the second fluid has a different specific gravity than the first fluid; and a pump configured to pump at least one of the first fluid and the second fluid into at least one of the first containment chamber and the second containment chamber via the respective first fluid connection device or the second fluid connection device.