We’ve already seen inside it. It’s the secret workspace of banshee. You go in there for the leviathans breath but the bow is locked. You then have to get an encryption key by doing a bunch of stuff. After that you head back to banshee to pick up your bow.
English
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You're thinking of a different room. He's talking about the one in the hanger, right above us when we enter the hanger.
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You can get into that room from the leviathans quest. Christ people do your research.