Topic - St. Petersburg Subway

The Saint Petersburg Metro, the system exhibits many typical Soviet designs and features exquisite decorations and artwork making it one of the most attractive and elegant metros in the world. Due to the city's unique geology, the Saint Petersburg Metro is one of the deepest metro systems in the world and the deepest by the average depth of all the stations. The system's deepest station, Admiralteyskaya, is 86 metres below ground. Serving about 2 million passengers daily, it is also the 19th busiest metro system in the world. - Source: Wikipedia