I have the (mis) fortune to live on LV426, errr I mean Seaham.
Its a shame it got demolished.
looking at the map, you get a great view out over the north sea. The area was plagued by U-Boats, as the majority if coal from the Durham coalfields was shipped from the Wear, and Seaham. Seaham had a chemical works, a bottle works (the famous Candlish company) and two pit heads literally at the top of thr cliff, as well as a major (for the victorian period, as ships grew larger and the railways expanded it was becoming a less useful port) coal port. A U-Boat could cause serious problems, and was noted as sinking a few ships just off the harbour. The sound mirror could allegedly detect a surfaced u boat, so the location is ideal.
Seaham also featured at the end of get carter. After starting on foot, theres a running fight from Dunston Staithes to the Blast Beach at Seaham. Geography apparently wasnt the strongpoint of the script. The blast beach had negative coastal erosion fir a long time, thanks to the coal waste dumped there. its just around the headland from chemical beach. The cliffs on the blast beach were used in the title sequence for Alien 3, as Ridley Scott didnt need much imagination to envisage it as a blasted hellscape for a prison planet. That would be an improvement over early 90s seaham ;)
Seaham is a nice little town now, defintely worth a visit.