Subspace current

Subspace currents (or subspace waves or subspace hitchhikes) were naturally occurring subspace phenomena. They were commonly recognized as subspace vortexes or ellipsoid bubbles of subspace energy which fly trough subspace.

When utilized as propulsion, amplification to them allow for high warp travel. The Galactonian Motherships cylindrical shape caused them to utilize it as a form of propulsion.

In the case of artificially or naturally induced destabilizing of these currents. A subspace shockwave would perforate normal space and cause spatial fluctuations.