THE PHILADELPHIA EXPERIMENT
A claim that in 1943 the U.S. Navy made the destroyer escort USS Eldridge invisible, and briefly teleported it, off Philadelphia. The Navy says it never happened.
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The Philadelphia Experiment is a claim that in October 1943 the U.S. Navy used the destroyer escort USS Eldridge (DE-173) in a test that made the ship invisible to radar, then to the eye, and briefly teleported it from the Philadelphia Naval Yard to Norfolk, Virginia, and back. The Navy says no such experiment took place [1].
The Office of Naval Research, which the story names as the sponsor, has stated that the account is at odds with what physics allowed in 1943 and that ONR has never conducted research into invisibility or teleportation [2]. The Eldridge was commissioned in August 1943. Its deck logs and service record place it on convoy and training duty, not at the Philadelphia yard on the dates the story gives [3]. The ship was transferred to Greece in 1951 and served as HS Leon for decades, and surviving crew have said they were never near Philadelphia in 1943.
The mainstream explanation traces the legend to a real wartime procedure called degaussing. Ships had their hulls demagnetized by running current through coils, which made them harder for magnetic mines and torpedoes to detect [4]. A vessel could be called "invisible" to those mines. Over retellings, "invisible to magnetic detection" appears to have hardened into "invisible," and a routine countermeasure became a story about vanishing ships.
The account itself has a single documented origin. Between 1955 and 1956 a man writing as Carlos Allende, later identified as Carl M. Allen, sent letters to the astronomer and writer Morris K. Jessup describing the experiment, and annotated a copy of Jessup's 1955 book The Case for the UFO. Charles Berlitz and William Moore built the 1979 book that carried the story to a wide audience from those materials [1]. No Navy record, log, or contemporaneous document describing the test has ever surfaced.
- [01] U.S. Naval History and Heritage Command. Information Sheet: The 'Philadelphia Experiment.' Official statement that no such project existed.
- [02] Office of Naval Research statement on the Philadelphia Experiment and the annotated 'Varo edition' of Jessup's book.
- [03] USS Eldridge (DE-173) deck logs and service record, U.S. National Archives. Place the ship away from Philadelphia on the claimed dates.
- [04] Vassilatos, G.; and U.S. Navy degaussing program records. Wartime hull demagnetization to defeat magnetic mines.
The vanished-ship story has drawn several explanations beyond the Navy's account. Each has a traceable origin and a documented response. They are laid out in full so you can weigh them yourself.
An Einstein unified-field test (1955)
The core claim, from Carl Allen's letters to Morris Jessup, holds that the Navy applied Einstein's unified field theory to bend light and radar around the Eldridge, that generators produced a green haze, that the ship teleported to Norfolk, and that crew members were left disoriented, burned, or fused into the deck [1][2]. The response: Einstein never completed or published a unified field theory, the equipment described did not exist at that scale in 1943, the ship's logs place it elsewhere, and Allen later told investigators he had invented parts of the account, then reasserted them.
A garbled memory of degaussing
A milder version holds that the story is a distorted memory of real degaussing work, which made hulls "invisible" to magnetic mines. This overlaps with the mainstream explanation. The point of difference is only how much was added in retelling: the documented degaussing program is real, and "invisible to magnetic detection" is the most likely seed of "invisible."
A larger secret program at Montauk (1980s)
Preston Nichols and Peter Moon extended the legend in The Montauk Project, tying the 1943 test to later time-travel and mind-control work at Montauk, New York, with Al Bielek claiming to be a surviving crew member [3]. The response: Bielek's biography and claims shifted over time and conflict with records of his life, no documentation supports a Montauk program, and the account depends on the original Allende material it tries to extend.
- [01] Allende, C. (Carl M. Allen) (1955-1956). Letters to Morris K. Jessup, and the annotated 'Varo edition' of The Case for the UFO.
- [02] Berlitz, C. & Moore, W. (1979). The Philadelphia Experiment: Project Invisibility. Grosset & Dunlap.
- [03] Nichols, P. & Moon, P. (1992). The Montauk Project: Experiments in Time. Sky Books. Source of the time-travel extension.
- [04] Einstein, A. Unified field theory papers, 1920s-1950s. No completed theory was published in his lifetime.
INFORMAL READER POLL, NOT DATA. WHICH EXPLANATION DO YOU FIND MOST CREDIBLE?