This story doesn't hold up under scrutiny. In modern times, if a device has been designed, another one can be built using the knowledge acquired from the first project. So the fact that the prototype rocket pack's location is not known doesn't matter, all one needs is the specifications and method of construction.<p>The story resembles the kinds of stories told in the pre-industrial era, when one-of-a-kind devices were built that could not be recreated, like the Antikythera device:<p><a href="http://en.wikipedia.org/wiki/Antikythera_mechanism" rel="nofollow">http://en.wikipedia.org/wiki/Antikythera_mechanism</a><p>But this isn't how modern technology works. Something is rotten in Denmark.