SS Shieldhall is a preserved steamship that operates from Southampton. She spent her working life as one of the "Clyde sludge boats", making regular trips from Shieldhall in Glasgow, Scotland, down the River Clyde and Firth of Clyde past the Isle of Arran, to dump treated sewage sludge at sea. These steamships had a tradition, dating back to the First World War, of taking organised parties of passengers on their trips during the summer.