If you liked Snail's Theory, then you'll love his Shivan Comm Node non-canon unofficial tech description!
All details concerning this object have been classified level Omega, accessible only by those immediately authorized by the GTVA Security Council.
These enigmatic static emplacements are essentially extremely powerful subspace communication arrays. It is theorized that these communication terminals, or Shivan Communication Nodes, as they have been named, are designed with the purpose of communicating with specific points over intergalactic distances. However, the amount of energy needed to do so is immense, and hence upon its destruction considerable amounts of energy are released. The spinning blades and shell form a highly directional subspace field through which quantum pulses are exchanged. It is theorized that the objective vortex can also be used as the inceptive vortex, through which subsequential quantum pulses can be relayed. This creates a form of two-way communication between vast distances. The technological implications of such a device pose numerous significant questions. Could the same technology be used to communicate with Earth? Or more urgently, could a similar principle be applied by the Shivans to create jump nodes which are traversable by ships of significant size? Though these questions will not soon be answered, the enigma of this device yet more emphasizes what little we know about the race we call the Shivans.