variants
or sub-cellar
plural subcellars or sub-cellars
: a cellar that is below another cellar : subbasement
The owner … hired the architect … to design and build a four-story building, with a raised basement and a subcellar …—Albert Amateau
… the institute's … vault, the subcellar archive with no windows …—Donald Antrim
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Merriam-Webster unabridged
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