The Philadelphia Project, also known as the Philadelphia Experiment or Project Rainbow, was a 20th century United States naval military experiment that occurred at the Philadelphia Naval Shipyard, in Philadelphia, Pennsylvania.
The experiment in 1943 attempted to make the Navy Destroyer Escort USS Eldridge become invisible, teleport and travel through time.
According to an email from Abstergo Industries' Alan Rikkin, the use of a Piece of Eden on board allowed the ship to manifest itself in a future state for approximately 18 minutes, though the experiment somehow damaged the Piece in the process.
Rikkin stated that Abstergo had recovered enough data needed to repair the artifact between 1943 and 2012; however, Abstergo's Administration branch refused to move on with the project, citing paradox concerns. Rikkin finished the email by stating that company policy dictated any object with the capability to manipulate time had to be contained, thus the Piece of Eden was moved to a secure storage location.
- Shortly before his death in 1943, Nikola Tesla supposedly claimed to have completed some kind of a "Unified Field Theory", though it was never published. It is widely thought that the disappearance of USS Eldridge was made possible through the application of this theory.