Lifting Agent
The blimps are filled with helium. The helium is maintained under low pressure, so small punctures do not pose serious consequences for the blimp. One inspection element of the blimps is to look into the envelope for pinpoints of light which are indicative of small holes.
The Goodyear blimps are non-rigid (meaning their shape is not maintained by a rigid internal structure) dirigibles (directable/steerable airships). Inside their exterior envelope, the Goodyear blimps are fitted with air–filled ballonets. As the blimp ascends or descends, the internal ballonet expand or contract to compensate for density changes and to maintain uniform pressure in the envelope.
Read more about this topic: Goodyear Blimp
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