Sannikov Land
In the summer of 1937, "Sadko" sailed from Murmansk. Its original goal was to sail to Henrietta, Zhokhov and Jeanette Islands in the De Long group, search for Sannikov Land and carry out scientific research. The purpose of the expedition was also to find out how the Northern Sea Route could be used for regular shipping. But the Soviet naval authorities changed the plans and the ice-breaker was sent instead to help ships in distress in the Kara and Laptev Seas.