日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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I've been reading a book and stucked with this sentence: この臨戦態勢の中で、あたしたちボスに通じる次元回廊を開放しておくほど彼も馬鹿じゃないから。 I cannot grasp which particle should be between あたしたち and ボス? I'd say は, can really if it's fine with 通じる. The dimensional corridor we walk(?) to get to boss...