It was described as a gold, blazing serpent. The Split Infinite was created when a cosmic string intersected a pulsar. The pulsar, a rotating neutron star, made the string spin thousands of times per second. The rapid rotation and gravimetric distortion of the pulsar combined with the spinning string to rupture the fabric of space-time and create a wormhole. The phenomena generated plasma storms, gamma radiation, neutrinos, chronitons and radiogenic particles, with radiation levels off the scale.
The pulsar no longer had planets. Gravitational forces had long ago crushed them into crisscrossing debris fields. The wormhole went nowhere, looping back to itself. But the string was infinitely long and acted as a natural Tipler cylinder. Traveling along the string at warp would enable a ship to travel backwards in time.
In 2383, during recovery operations of the newly discovered Intrepid (NX-07) led by Geordi LaForge and Reginald Barclay, Berlinghoff Rasmussen and DaiMon Bok commandeered the old starship. Rasmussen wanted to return home to 2162. Bok intended to prevent his son from being killed at the Battle of Maxia and make covert investments. Rasmussen fired a test probe along a precise trajectory into the Infinite. When it was discovered 15,000 km away and retrieved, its chronometer showed that 167 years had passed since its launch, confirming a successful transit through time.
Under the command of Montgomery Scott, USS Challenger beamed back Intrepid’s Starfleet crew, but Bok was able to take the Intrepid into the Infinite along a pre-programmed trajectory. However, the annular confinement beam from Challenger’s transporter had affected Intrepid’s course, moving it closer to the cosmic string and for an emergence further back in time. Scott amplified the confinement beam so that Intrepid was forced to travel back to the moment before the string existed. It emerged into space moments after the Big Bang, which destroyed the vessel. (TNG novel: Indistinguishable from Magic)