Tertiary subspace manifold
The tertiary subspace manifold was one of many domains located in the myriad layers of subspace. The solanogen-based lifeforms called the tertiary subspace manifold their home, which emits a subspace energy level of 16.2 keV.

In 2369, they tried to open a gateway between their domain and the regular universe by means of a spatial rupture created by sending spatially-inverted tetryons through a rift. They were stopped by the crew of the  before they could enter the universe, but were able to abduct some members of the crew into their domain, where they had formed a bubble of the regular universe and conducted experiments on the crew. ()

de:Tertiärer Subraumbereich
Subspace