These structures were constructed by hand, without mortar, and were associated with nearby settlements or ringforts. Their precise function is still debated among archaeologists, though they are generally understood to have served as places of refuge, cool storage for dairy produce, or both. The fact that one exists at Hampstead is itself a quiet reminder that this corner of Galway was occupied and organised long before any written record of it survives.

Beyond its classification and location, the details of this particular souterrain remain largely undocumented in the public domain. No excavation reports, no dimensions, no account of what, if anything, was found inside appear to be readily available. That absence is not unusual for souterrains across Ireland, many of which were noted in the nineteenth or early twentieth century by local observers or county surveyors and have received little formal investigation since. What can be said is that souterrains in Connacht are well attested, and those in Galway frequently occur in association with the remains of enclosed farmsteads, suggesting a landscape of small agricultural communities whose underground architecture has quietly outlasted almost everything else they built.