The STS Sedov . The STS Sedov , formerly the Magdalene Vinnen II (1921–1936) and the Kommodore Johnsen (–1948), is a 4-masted steel barque that for almost 80 years was the largest traditional sailing ship in operation. Originally built as a German cargo ship, the Sedov is today a sail training vessel, training cadets from the universities of Murmansk, Saint Petersburg and Arkhangelsk.