Transwarp aperture

A transwarp aperture is a structure built by the Borg, usually connected to transwarp hubs. The aperture could be connected to a transwarp conduit, stabilizing it (if it was generated by a transwarp drive). The side connected to an aperture did not require tachyon pulses to open them, as they were always open. The structures are hexagonal, with an arm connected to the transwarp hub. The lost starship USS Voyager used one of the apertures to enter a conduit, which led to home.