The Slipstream is a naturally-occurring Time Anomaly. First discovered by scientists in 1981, it is a space within which all events in time exist simultaneously, allowing for near-instantaneous travel between time periods for those capable of moving within it.
The slipstream is not visible to the naked eye; its boundaries are roughly denoted by a persistent temperature gradient where areas in the slipstream are heated to approximately 0.16 degrees Celsius above ambient. This temperature gradient occurs over a span of approximately four meters and its borders are not constant, moving sometimes inwards and outwards by up to 20 meters over the span of days to weeks. This heating appears to affect all known materials roughly equally and, as such, is apparent in soil, air, and even within the walls of buildings spanning the border. By averaging temperature readings over multiple years, a rough boundary can be found - a worm-like shape pointed at both ends, approximately 31 kilometers long, and varying between 400 and 780 meters wide along its length (except at its ends). It extends approximately 80 meters above the ground, such that the upper floors of very tall buildings such as the Minto Metropole, which would otherwise be located within it, are actually slightly outside it. Its maximum depth is unknown - boreholes of up to 710 meters in depth have yet to discover a lower boundary.(1)
The most commonly accepted theory regarding the slipstream's existence is that it is the fourth dimension, much like the Z-axis is the third.
The slipstream has, presumably, existed for as long as the known universe; time-active entities such as the Admiral and Ethan have long been able to access the slipstream for personal use. In 1980, during OC Transpo's construction of the Transitway, the City of Ottawa documented the first time anomaly after a screw holding a 'No Parking' sign at Hurdman Central Station would unscrew itself no matter which way it was rotated. The following year, a construction crew discovered the slipstream by mistake when a Ford 555 backhoe was pulled into it; the Admiral later located it in the late cretaceous period, circa 73mya. The Canadian Time Anomalies Analysis Bureau was founded by the Canadian government to investigate and monitor the slipstream, before being absorbed into OCESS in 1990.
- (1)Personal description by Ethan