It happened to my boat some years ago next to Helgoland in 15 m/s weather. I was coming back from a long patrol at full speed. I thought then that the boat hit the bottom in the shallow waters there. Damages were minor.
I always slow down passing around Helgoland since then.
I suspected mines as well, but I don't recall mines to be shown in any GWX map... or I missed it.
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