Thanks Danilsa,
It is just a two hours bio-coating (sea alge formation)... that I saw on "neglected" wessel surfaces...
I noticed that misty-wholes effect by myself... it takes five minutes to clear.
By the way, do You know if bottom grey color applied by Criegsmarine was pure anti-corosion coat, or it was also bio-repellent... ? :hmm:
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