Although highly improbable, the Zeppelin Bend has been described as being used to secure Airships.
(Animated Knots) The Zeppelin Bend is reliable with very little tendency to slip or bind. Testing by Roo found the knot to be exceptionally secure and shake-resistant in all materials. In this respect he regards it as superior to the Alpine Butterfly Bend.
(Wikipedia) Despite being declared by many sources as a nearly ideal rope joining knot, it is not very well known: it is not included in the chapter covering 'bends' (end-to-end joining knots) in the original publication of The Ashley Book of Knots.