Remnants of its construction remain in the villages of Charlton Mackrell and Long Sutton.
During its construction, explosives were stored in a powder house in Charlton Mackrell; according to local historian Derrick Warren, this structure is still standing.
[3] Another building believed to have been used as an explosives store is located at a distance from the tunnel's western portal in Long Sutton, is in a derelict condition.
[4] A worker was killed during the tunnel's construction in an incident that involved blasting charges that had failed to detonate as planned.
In March 2020, Network Rail undertook work to improve drainage in the tunnel.