The SI planet and totally top-secret. Nigel and Ozzie helped establish the planet for the SI's that had evolved out of the AI smartware that were running in CST arrays. Vinmar is a barren airless rock with no tectonic activity located in a star system with no habitable planets. When the planet was established a great amount of equipment was sent through along with solar and fusion generators. Over time, the SI took over all transports to the planet until, in 2178, it reduced the wormhole to a micro-width connection to Augusta.
There has been some conjecture that the SI might have an analogue of a sense of humour as the name Vinmar is an anagram of the name of the Robot Marvin from The Hitchhiker's Guide to the Galaxy, said to possess a "Brain the size of a planet"