Primer (film)

Primer is a 2004 American indie science fiction drama film about the accidental discovery of a means of time travel. The film was written, directed, produced, edited and scored by Shane Carruth, who also stars in the main role.

Two engineers Aaron and Abe supplement their dayjobs with entrepreneurial tech projects, working out of Aarons garage. During one such research effort, involving electromagnetic reduction of objects weight, the two men accidentally discover an AtoB time loop sideeffect objects left in the weightreducing field exhibit temporal anomalies, proceeding normally from time A, when the field was activated, to time B, when the field is powered off, then backwards from B back to A, in continuous AthenBthenAthenB sequence, such that objects can leave the field in the present, or at some previous point.Abe refines this proofofconcept and builds a stable timeapparatus the box, sized to accommodate a human subject. Abe uses this box to travel six hours into his own past as part of this process, OriginalAbe sits incommunicado in a hotel room, so as not to interact or interfere with the outside world, after which OriginalAbe enters the box, waits inside the box for six hours thus going back in time six hours, and becomes FutureOverlapDoubleAbe, who travels across town, explains the proceedings to Aaron, and brings Aaron back to the secure selfstorage facility housing the box. At the end of the overlaptimespan, OriginalAbe no longer exists, having entered the box, rewound six hours, and become FutureOverlapDoubleAbe for the remainder of time. ........

Source: Wikipedia