The way this worked for me was that I first did the job for Crutch's bodyguard, steal a case from the Diggers - this is at the northern building at Aggroprom not the Duty outpost. Later in the game (after other quests) I got a job to visit a scientist at Agroprom. For me, this resulted in a cut-scene sometime after going to Agro. I was caught by the Diggers I had stolen the case off & HAD to go into the underground. After this I visited the scientist & could enter the Duty base some time after. Hope this helps.
chrisjb
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