Animation shows how to tie the Double Fisherman's Knot for Climbers and Rescue Workers. From the world's #1 knot site - Animated Knots by Grog. IPHONE APP: http://bit.ly/SeY9S7 IPAD APP: http://bit.ly/IiiIxL ANDROID APP: http://bit.ly/PmhDXy MORE INFO: http://www.animatedknots.com/doublefishermans