He was in the habit of using prisoners for his projects. He brought some to Voronezh in the Ukraine to build boats, others to build St Petersburg. Later after conquering Estonia he sent them to the port at RÃ¥gervik. He put them to work in Azov with their families which he had just conquered. They were to be rowers. Peter also sent people to settle Siberia and branded them or cut off their noses so they could not escape and go to the city. .