How to Tie a double fisherman's knot or double overhand knot

The double fishermen's knot, as demonstrated in this how-to video, is a safe knot to secure to separate lengths of rope together, forming high-strength loops of cord. This makes it useful in rock-climbing and in search and rescue, especially as a backup for other knots. Check out this video survival training tutorial and learn how to tie a double fisherman's knot or double overhand knot.