context: The new saw mill, founded in 1722 on the site determined by the decree of Peter I of May 22, 1719, laid the foundation for the development of the industries that soon appeared in it - iron, copper, anchor and hammer plants, assigned to the Admiralty, therefore called the "Admiralty Izhora plants." Since its foundation, it has been a state enterprise.
question: When did the Izhora plant begin work?
answers.text: 1722