To keep travelers moving in this city that straddles Europeand Asia on the Bosporus Straits the city started buildinga subway system in 1992 and has developed it continuouslyever since. One of the newest lines passes under the straitsat a depth of 60 meters, improving the link between the twoparts of the city. The subway carries 1.5 million passengersa day on more than 80 kilometers of track connectedto a high-frequency bus network. And this is only the beginning:the city plans to continue expanding the system.