Quantum singularity drive

The Quantum Singularity Drive was an experimenta propultion system created by the New Terran Empire in the Mirror Universe. (Star Trek: Constance)

Properties
The Quantum Singularity Drive was created by Terran Empire scientists in an effort to spread the Empire's authority beyond the Mirror Universe. Its exact properties are unknown, but it tears a hole in the border between universes to transport an entire ship.

Test Run
The initial test run was done by the crew of the ISS Constance in the Badlands. The drive intersected with a spatial anomaly, and as a result the captains of the two ships switched places, the ISS Constance returned to the Mirror Universe for further testing.