It uses alien technology obtained by the intial Stargate mission from the movie. Amoung the artifacts discovered on Abydos is the 'head gear' of Anubis (the dead soilder of Ra, not the half ascended fellow) which disappeared into seemingly thin air. The artifact was brought back to Area 51 and reverse engineered to create the Iris which can fold back into seemingly nothing.
It was built and tested, but never installed because they only thought the gate could connect with Abydos, and they buried their Stargate. When the program was restarted (as result of Apophis' attack) the Iris installation was completed.
It was built and tested, but never installed because they only thought the gate could connect with Abydos, and they buried their Stargate. When the program was restarted (as result of Apophis' attack) the Iris installation was completed.
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