A souterrain, one of the stone-lined underground passages or chambers built during the early medieval period in Ireland, typically for storage or refuge, sits recorded on old Ordnance Survey mapping but offers nothing visible to a visitor standing above it. The ground gives nothing away.

The souterrain is noted as lying on the northern bank of a moated site, which is itself a separate monument. Moated sites are low-lying enclosures surrounded by a water-filled or wet ditch, most commonly associated with Anglo-Norman settlement in Ireland from the thirteenth and fourteenth centuries. The pairing of a souterrain with such a feature is an interesting detail, since souterrains are generally associated with earlier, Gaelic-Irish settlement patterns, raising quiet questions about the sequence and nature of activity at this particular spot. What makes the picture slightly stranger still is that a second souterrain was recorded approximately forty metres to the north-east of this one, suggesting that whatever was happening at Kildrum in the past left more than one trace underground, even if the surface above has long since smoothed itself into silence.