Bund wall failures have occurred in the UK, such as at Warrington, Cheshire in 1994. A polypropylene tank holding about 30 tonnes of 40% aqueous caustic soda sprang a leak about halfway down the main wall. The corrosive fluid jetted out over the bund wall, causing great damage to the surrounding factory and adjacent premises. The bunding at Buncefield also failed to contain petrol and fire fighting water after the initial explosion and subsequent fire.