This underground passage lay beneath what was an extension to the local hospital, though no physical trace of it remains today. The structure was located near Kilbride Burial Ground, a site catalogued as DG011-037 in archaeological records, suggesting this area held significance for the local community across different historical periods.

Souterrains are fascinating features of Ireland’s archaeological heritage; these man-made underground passages and chambers were typically constructed between the early medieval period and the 12th century. They served various purposes, from storage spaces for food and valuables to places of refuge during times of conflict. The proximity of the Ballylosky souterrain to both a burial ground and later a hospital site hints at the continuous human activity in this area over many centuries.

While the souterrain itself has been lost, its documentation in the Archaeological Survey of County Donegal ensures its place in the historical record. The survey, compiled by Brian Lacey and his team in 1983, represents a comprehensive effort to catalogue Donegal’s field antiquities from the Mesolithic period through to the 17th century. Though we can no longer explore this particular underground structure, its inclusion in the survey reminds us of the hidden histories that lie beneath seemingly ordinary Irish landscapes, waiting to be remembered if not rediscovered.