File:Barmston Main Drain - geograph.org.uk - 621455.jpg

English: Barmston Main Drain, south-east of Barmston, East Riding of Yorkshire, England.
Pillbox on the land drain just a few yards from the beach, on the parish boundary between Barmston and Ulrome. Just east of here the drain disappears into a pipe set in concrete which carries water draining off the farmland out into the sea. Under the Beverley and Barmston Drainage Act of 1798, part of Barmston Main Drain (and also part of The Earl's Dike to the north of the village) was diverted eastward towards the sea from its natural westward course into the floodplains of the River Hull.

The land south of Bridlington is only a few metres above sea level and this area which is now constantly threatened by the North Sea was thought extremely vulnerable to enemy attack during the Second World War and was heavily fortified. Many major defensive installations have been destroyed by erosion and some of the pillboxes now close to the beach would once have been in supporting positions further inland. Some of these concrete structures were removed in the 1970s and local farmers complained that this increased the rate at which farmland was washed away by the sea.