The Philadelphia Experiment was supposedly carried out by the U.S. Navy at the Philadelphia Naval Shipyard in Philadelphia, PA on or about October 28, 1943. The destroyer escort USS Eldridge was claimed to have been rendered invisible (or "cloaked") to enemy devices, with disastrous results for the ship's crew. The story first appeared in 1955, in letters sent to writer and astronomer Morris K. Jessup.
The so-called "Philadelphia Experiment" originally created quite a stir in the late '70s. At a time when the Bermuda Triangle, cattle mutilation, and Pyramid Power were attracting much attention, the Philadelphia Experiment attained its own niche in the weird science field. At one time, actor Richard Dreyfuss planned to makes a movie on the topic, but that never came to pass. Eventually the tale inspired two movies, one in the '80s ("The Philadelphia Experiment") the other in the '90s ("The Philadelphia Experiment 2").
Almost twenty years on since its arrival in public awareness, relatively little is available on the subject. A search of two major chain bookstores and two decent libraries turned up nothing on their shelves. Eventually this author was able to special order ONE book, published in 1979.
The primary source for the "Philadelphia Experiment", it turns out, comes from ONE man, the mysterious Carlos Miguel Allende. According to authors William L. Moore and Charles Berlitz in their influential, if speculative, 1979 book "The Philadelphia Experiment: Project Invisibility," Allende's main statements/writings can be summarized thusly:
Even The Philadelphia Experiment's name is not what it seems. According to Moore and Berlitz:
"Exactly why or how the ship experiment outlined in the Allende letters came to be called the Philadelphia Experiment is not exactly known, although it is certain that the designation is definitely not an official one. As far as is known there has never been a military undertaking of any sort which used that project title. It is more likely that the name arose out of the need of one or more of the early researchers into the matter to call it something; and since at least a portion of the project allegedly took place at the Philadelphia Navy Yard, it seemed only appropriate to refer to the entire affair as the Philadelphia Experiment. In any event the name stuck, and we might as well continue to use it."
According to the Department of the Navy, in a document dated July 23, 1976:
"As for the Philadelphia Experiment itself, ONR (Office of Naval Research) has never conducted any investigations on invisibility, either in 1943 or at any other time. In view of present scientific knowledge, our scientists do not believe that such an experiment could be possible except in the realm of science fiction. A scientific discovery of such import, if it had in fact occurred, could hardly remain secret for such a long time."
There's reason to believe The Philadelphia Experiment never happened. Since the primary source for the story is one man of questionable veracity — Carlos Allende — the Philadelphia Experiment may very well be the Naval equivalent of an Urban Myth: a tale that many people believe is true and wish to be true, but which is, sadly, probably a myth.
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