> this way and I assure you that this knot is almost "undonable"...
> it is also used in some life dependable mountain rescue equipment,

As a climber, I'd like to comment on the double fisherman. Yes, the double
fisherman is used in climbing and mountain rescue for life dependent
situations. Typically to join two ropes together for rapelling (descending
down a cliff). So, yes the knot is very secure and I use it as my primary
rapell knot.

However, a double fisherman is realitively easy to untie if unloaded. The
trick is to roll the knot back and forth between your hands. This loosens up
the knot enough to work free. Potentially this could happen if the knot is
rubbed between two pieces of gear.

For climbing applications, the knot is weighted under load and as such very
difficult to untie. When using a double fisherman in climbing the pratice is
to weight the rope w/ body weight after tying the knot. Plus you should
leave several inches of tail (this is w/ 8-11mm ropes).

For thinner ropes (or slippery ropes like spectra cord) it is recommended to
add an additional loop making the knot into a tripple fisherman's knot.

David



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