A fire has engulfed the historic Naval Institute building in St. Petersburg as over 100 firefighters and more than 20 fire trucks rushed to battle the blaze. The fire broke out in Russia's second largest city, as the masses of firefighters were assisted by cadets. Smoke left a blanket over the Vasilyevsky Island district as the flames engulf the mid-18th-century building which belongs to St. Petersburg's oldest educational establishment. The fire was classed at level three, just two notches below the most difficult rating. Additional firefighting crews had been called in as a result. Russia's Emergencies Ministry said 22 fire engines and over 100 firefighters were at the scene. It took all of the firefighters, assisted by naval cadets' firefighting team over two hours to get the blaze under control. The flames were put out before they could spread to nearby buildings which were mostly made out of old wooden internal structures. No one was injured. A mobile chemical lab has already been called in to try and determine the cause of the fire. Peter the Great Naval Corps or St. Petersburg Naval Institute, is the oldest naval officer college in Russia. The academy was founded in 1701 by Peter the Great in Moscow. The school was, however, relocated soon after the city of St. Petersburg was founded in 1703.