The planet known as Tollan was facing a major cataclysm. The people, the Tollans, were planning a relocation to another planet but they were unable to survive long enough for their transports to pic them up. Fortunately the remaining Tollans were rescued by the U.S. Air Force and with the help of the Nox they were able to travel to their new homeworld. Their new home, Tollana, had no Stargate but they solved it by building their own.
It's very big, very slim and very white.

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Keywords:
stargate, star, gate, chappa'ai, event, horizon, water, chevron, constellations, earth, indeed, phail