We were just at the Vancouver Boat Show. They had a couple of anchors on display. Salesman suggested these as anchors guaranteed to keep a 30 ft boat in place in the Gulf Islands off Vancouver Island. View attachment 161207
For perspective I stand 5ft 10. And theshanks of these stood above my waist.
Pretty sure there would be a fitting issue and loading them on a boat would affect the balance. But on the plus side once deployed the boat would need to chafe through the line before it got away. Guaranteed not to drag.