I watched this and actually wonder, do you know if plow anchors will grab hold for 6 minutes in mud and then they all break out drop close to zero holding? They consistently make this observation in the video. Why is that?
I anchor in the Chesapeake mud using a big Seachoice fluke anchor and it mostly works fine holding the 37 foot boat. Even in a thunderstorm it has held without slipping. Also I don't have any chain.