New answers tagged plot-device
15
Becalmed in Hell by Larry Niven addresses this.
The ship uses a nuclear ramjet/chemical rocket propulsion system, and the fuel is kept in a "blimp tank".
Our ship hung below the Earth-to-Venus hydrogen fuel tank, twenty miles up and all but motionless in the syrupy air. The tank, nearly empty now, made an excellent blimp. It would keep us aloft as long ...
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