The 1933 edition of the Ordnance Survey six-inch map marks the spot with the label "Cave", written in Roman script, which was the cartographers' convention for indicating a feature of local note rather than a certified antiquity. That small typographic choice is now the entirety of the record. No hollow in the ground, no tumbled stonework, no earthwork depression remains to mark where it stood.

Souterrains are stone-lined underground passages or chambers, built during the early medieval period and associated most often with ringfort settlements. They served likely as cool storage spaces and possibly as places of refuge. The Crinnage example has since been swallowed entirely by the pastureland above it, whether through deliberate infill, agricultural levelling, or simple collapse over the centuries. What the 1933 map was recording, and how that knowledge reached the cartographers, is no longer traceable. It may have been a local name passed down through generations, a visible feature that has since vanished, or a combination of both.