As mentioned several times in
Rome's Revolution and later in
The Ark Lords, there was a static tunnel built between Earth and Helome which allowed easy and quick travel between the two worlds. Because Helome was just starting out as a new colony, you'd have to think it was for transporting colonists and supplies. But why go through such an engineering effort for a sparsely populated world? Especially because travel through the tunnel rendered most Vuduri unconscious unless they were wearing a T-suppressor.
The Overmind of Earth never does anything capriciously or for a trivial reason. Could there be a second, more insidious purpose for building this tunnel? MINIMCOM refused to ever use it claiming either it was at the wrong vector or later because he could fly so much faster that the effective speed the tunnel could provide.
Never fear! The answers to all your questions are coming in the upcoming novel
Rome's Evolution which should be out in the next two months.