if you have played MGS 1, you know what to do... if not, there are two air ducts there that you can crawl into... one is on the stairs and one in the left corner of the building...
or if you cant get up into the air ducts you can just press quit from the pause menu. but beating that level the normal way shows you how to get into the base which can make things easier, not the only way to get into the base though.
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