Examination of a series of tunnels below this road was carried out by members of Subterranea Britannica, at the request of SCC’s County Roads Group. The tunnels are almost certainly service tunnels associated with the now demolished Ewell House and probably date to the late 17th or early 18th centuries. Some of the tunnels are lined with brick, others are just left as the sandstone they have been cut through. Later modification included ornamentation of some of the tunnels and use as a WWII air-raid shelter. A separate report indicates that some stabilisation of the tunnels is required, but it is hoped that they can remain open.