The massive project will connect the Sea of Marmara and the Black Sea, which the Bosporus Strait already does. But the new canal is designed to alleviate congestion in the strait. The waterway is expected to cost $17 billion, though some estimates run much higher. The channel will measure around 45 kilometers (28 miles) in length and 150 meters (490 feet) in width, and will run between Istanbul’s Arnavutkoy-Avcilar districts. Boring began Jan. 9.