thanks for making the video, it was well done. as a side note i think too many people take things like this for granted. i mean the infrastructure, ships, so on
I had to ask my German friend this question and he said, The baltic is 1,8 %salt, Northsea 3,5 % salt but the Brunsbuttel side of the canal is mostly freshwater from the river Elbe. So I guess the canal is a sort of mix.