Subspace fissure
A subspace fissure was a type of subspace anomaly that affected normal space.

In 3189, Cleveland Booker took his ship into the Verubin Nebula to navigate the radiation hazards that the  was too large to navigate. He was able to get his ship to a subspace fissure in the nebula, which allowed him the clearance to complete scans of the crash site of the  on a planetoid. ()
Subspace phenomena