mine shaft ( synonym found)
Definition of mine shaft:

°A temporary, usually insubstantial, substitution for something else.
°Made to work or suffice; improvised; substituted.
"They used the ledge and a few branches for a makeshift shelter."
Definition of mine shaft:

°A temporary, usually insubstantial, substitution for something else.
°Made to work or suffice; improvised; substituted.
"They used the ledge and a few branches for a makeshift shelter."
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