me if I am wrong but the way you dislodge an anchor is to tie the rope to the front of the boat and pull the anchor forward. If you can't dislodge it then cut it off and go home. A life lesson here fellows if you ever find yourselves in a similar situation.
http://www.cnn.com/2009/US/03/27/florida.nfl.capsize/index.html
http://www.cnn.com/2009/US/03/27/florida.nfl.capsize/index.html