OK, it seems to be eddies. Just as for ice circles in rivers, in pools below constrictions. But they don't know why eddies are forming in Lake Baikal. Also, TF

OK, it seems to be eddies. Just as for ice circles in rivers, in pools below constrictions. But they don't know why eddies are forming in Lake Baikal. Also, TFA says nothing about the ~sunken vehicle in the 18 March photo. Odd.