This is "Aerostatic thermoballasted vehicle" ALA-40. (1990th)
Geometric data:
Outer diameter of the disk - 40 m
Maximum thickness of the disc - 36 m
Internal disk capacity (building) - 10,660 m3
Including:
amount of helium (minimum) - 5800 m3
volume of hot air (max) - 4860 m3
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