It has been claimed that the Philadelphia Experiment was partly an investigation into how Albert Einstein's "Unified Field Theory for Gravitation and Electricity" might be used to advantage in the development of electronic camouflage for ships at sea. Einstein allegedly published his Unified Theory around 1925-27 in German, in a Prussian scientific journal, but it was later withdrawn as incomplete. This research was aimed at using intense electromagnetic fields to mask a ship from incoming projectiles, mainly torpedoes. This was later extended to include a study of creating radar invisibility by a similar field in the air rather than in the water.

On the 28th of October in 1943, at 17:15, the final test on the Eldridge was performed. The electromagnetic field generators were turned on again, and the Eldridge became near-invisible; only a faint outline of the hull remained visible in the water. Everything was fine for the first few seconds, and then, in a blinding blue flash, the ship completely vanished. Within seconds it reappeared miles away, in Norfolk, Virginia, and was seen for several minutes. The Eldridge then disappeared from Norfolk as mysteriously as it had arrived, and reappeared back in Philadelphia Naval Yard. This time most of the sailors were violently sick. Some of the crew were simply "missing" never to return. Some went crazy, but, strangest of all, five men were fused to the metal in the ship's structure.

The men that survived were never the same again. Those that lived were discharged as "mentally unfit" for duty, regardless of their true condition.