A subspace tunnel is a wormhole-like opening through space-time. Although both are topologically similar tubes of genus one and allow passage through distant parts of a universe or between different universes, the difference is where and how they exist. As opposed to the curvature associated with a wormhole, a subspace tunnel phenomenon exists solely in subspace and is powered by dark energy drawn from normal space-time. However, dark energy produces hyperphasic radiation within the tunnel, which can cause immediate disintegration of organic matter unless a properly harmonized multiphasic frequency is channeled into energy shields.
The Caeliar had found a way to create artificial subspace tunnels, and used them as part of their Great Work — the tunnels were used to remotely observe and potentially make contact with other species beyond their evolution. The tunnels were extremely stable, and remained after they had been created. The tunnels were opened by using a soliton wave, with the frequencies of each terminus being different. The USS Titan detected the tunnels during a scan of a remote area and stumbled upon the Caeliar planet New Erigol in 2381.
At some point prior to 2381, the Borg Collective located a subspace tunnel that connected a location close to their space with FGC-SR37-758, the supernova remnant at the former site of Erigol now deep within the Azure Nebula. They used this tunnel to launch an invasion of the Federation and surrounding galactic powers. (ST - Destiny novels: Gods of Night, Mere Mortals)
|space weather||cosmic storm • distortion ring • gaseous anomaly (Herbig-Haro formation) • ion storm • magnetic storm • maelstrom • meteor shower • particle fountain • plasma storm • solar storm • spatial implosion • star-node • tachyon eddy • Thraz Streamer • wave nexus|
|gravitational anomalies||gravimetric distortion • gravimetric eddy • gravimetric interference • graviton ellipse|
|subspace anomalies||subspace compression anomaly • subspace distortion • subspace fissure • subspace fracture • subspace granulation • subspace gravity inversion • subspace gravity spike • subspace tunnel|
|temporal anomalies||Kerr loop • multiphasic temporal convergence • Nexus • temporal distortion • temporal gate • temporal rift • temporal vortex • Tipler cylinder • toroidal continuum fold|
|rifts and ruptures||dimensional gate • interphase • Janus Vortex • spatial distortion field • space-time fracture • spatial rift (spacial flexure) • subspace rupture • Tyken's Rift • warp-gate|