That is, in essence, the entire record: a chance find, a reputed discovery, and then silence.

A souterrain is an underground stone-lined passage or chamber, typically constructed during the early medieval period in Ireland, and associated with nearby settlement sites. They were used variously for storage, refuge, or both, and are found in considerable numbers across Kerry and the wider Dingle Peninsula. This particular example entered the archaeological record through J. Cuppage's 1986 survey of the Corca Dhuibhne region, listed simply as a reputed find with no dimensions, no photographs, and no follow-up description. Whether the ESB workers paused long enough to document what they had found, or whether the pole went in and the ground closed over again, is not recorded. The site sits in an area of the peninsula with a dense concentration of early medieval and prehistoric remains, which makes the find plausible, but plausibility is not the same as confirmation.