Who knows what kind of technology on these tracks?

In the photos of the Black Sea from the satellite is very well seen traces of enormous size. Traces obviously artificial origin. At first glance, they can be mistaken for signs of caterpillar platform, if not for their size. In such a trace width of about 6 km, and the length of the longest of more than 250 km.
Who knows what kind of mechanism could leave such traces?





A little closer



Tractor?



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