Is it possible for the Russians to conduct an amphibious landing in Constantinople in late 1915 or early 1916? The objective would be to keep the Ottoman troops tied up in Turkish Thrace after Gallipoli at least or enable the Entente to continue the advance to Constantinople. Could the assault succeed or would it fail with every battleship involved, including 2 Russian dreadnoughts? And, would submarines be useful? What would be the consequences of the assault failing or the Ottomans leaving WW1 in early 1916?