Today there is nothing to see. The ringfort that once enclosed it has been levelled, and the ground gives no indication that anything unusual lies below. That combination, a vanished monument containing a possibly intact underground structure, gives this site a particular quality: it is an absence that points to something present.

A souterrain is a man-made underground passage or chamber, typically associated with ringforts and dating to the early medieval period in Ireland. They were used for storage, refuge, or both, and were often carefully constructed from stone. The one at Lisnashearshane was noted by a researcher named Broker in 1937, who described steps descending between the two earthen banks, or fences, of the fort, with the entrance already closed at that point. Broker suggested the passage ran slantwise in an eastward direction, which is consistent with how souterrains were sometimes built to confuse or slow an intruder. The ringfort itself, a roughly circular enclosure of raised banks once used as a farmstead or defended dwelling, was a common feature of the Irish landscape during the early medieval period, though many have since been destroyed by agriculture. This one has been entirely levelled, leaving only the buried record.