At around 12:05pm on the 11th of July 1978, a fully-loaded tanker truck left a state-owned refinery in a small town in the autonomous Catalonian region of Spain. It set off on a routine trip to Puertollano, an industrial city approximately six hours away by road. The truck never reached its destination. Before it was even half way to its destination it would become the cause of an accident which would claim more than 200 innocent lives.