The Oil Mill Caves are easily visible from the road as they are situated directly behind a petrol station. They consist of a large U-shaped tunnel that has entrances at either end of the cliff.

These tunnels have served many different purposes over time, undoubtedly as air raid shelters during both World Wars and for storage. Today the lower tunnels are still in use for storage and workshop space, whereas the upper level has not been used for some considerable time.

Most of the tunnel is lined with concrete. The major problem with this tunnel is that it is saturated with water. Several years ago, a huge fire in the lower tunnels left the walls greatly weakened. They are now very unstable.