An airship system, including an inflatable airship of predetermined volume adapted to be filled with gas and to rise to a predetermined altitude, said airship having a hull formed from an inflated flexible gas containment primary envelope, at least one lifting envelope located within the primary envelope for containing the lifting gas, where the lifting envelope will expand to substantially occupy the space of the primary envelope when the airship is at its predetermined high altitude, at least one secondary envelope located within the primary envelope, which can be inflated when said lifting envelope is at lower altitudes to fill the balance of the space of the primary envelope, and air handling means external to the primary envelope and communicating with the secondary envelope for filling and emptying the secondary envelope.
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