Natural Gas Storage Containers - Anyone know??? Please could someone help me next to this question: How do Natural...

Please could someone help me next to this question: How do Natural Gas Storage Containers work? When they insincere and move down do they require space underground to move into, or are they split into sections and fold into another one?
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Answers:    Those sizeable cylindrical tanks are collapsible.
The freight of the tank supplies the pressure.