unplumbed

Adjective
  1. Situated at or extending to great depth;
    Too deep to have been sounded or plumbed (synset 300694418)
    "the profound depths of the sea"; "the dark unfathomed caves of ocean"; "unplumbed depths of the sea"; "remote and unsounded caverns"
    similar to: deep - having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination
    same as: profound, unfathomed, unsounded

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