Page 200 - Bob Holtzman "The Field Guide to Knots How to Identify.."
P. 200
7. The finished knot.
Untying: The Sink Stopper is difficult to untie and may have to be cut.
Sometimes, though, it can be untied by creating little bits of slack in small
stages. Pull alternately on: i) the opposite sides of the crossing turn; ii) one
side of the crossing turn and the working end just before it passes through
the bight; and iii) the other side of the crossing turn and the working end
before it passes through the bight. Eventually, you may gain enough slack to
release the working end from the bight.
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