sentences:  The scientists aboard took 415 astronomical measurements, 78 electromagnetic observations, as well as 38 depth measurements by drilling the thick polar ice during their 812-day stay aboard the "Sedov".Finally they were freed between Greenland and Svalbard by icebreaker "Joseph Stalin" on 18 January 1940.Captain Badygin, as well as the crew and scientists were welcomed back in the Soviet Union as heroes.