You find a letter on the desk.

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"Yes, I know it seems odd we're storing RM-35 cluster bombs down here, but you know how Wheeler is. Always prepared for everything. Anyway, as I will be leaving my post here I wanted you to know how to access the payload in case the colony ever had need for the explosives. I've included a diagram showing you how to disarm and access the RM-35s. Please keep this knowledge to yourself. There's no reason everyone needs to know what's in Hazmat.

Brad"

You find a diagram attached to the letter.