Rocna anchor settling in mud

Here you can see how my Rocna 15kg settles in sandy mud ground. The camera is placed on the rollbar. The footage was taken on 16.8.2019 in germany, Kiel fjord, Möltenorter Reede. The water depth is 4m, I put out 20 meter of 6mm chain. Wind gusts have been around 15knots. And SevenEleven is a modern 9m 4 tons sailing yacht.