As part of the Hastings Bathing Waters Project designed to reduce the frequency of sewage spills to the sea; a large storage volume needed to be created to store the combined flows until they could be treated and subsequently discharged.

The tunnel lining design incorporated a self-cleansing profile into the precast concrete segments, thereby substantially reducing the second stage concreting works.

Instead of a major concreting operation that would have taken in excess of six months, the tunnel was completed by slipforming in a few days.