Solution
When you go back to GCPD tunnels and go hunting for Enigma datapack in the lower floor, you will find that the elevator went back to the upper level and you're stuck. There is NO WAY to lower it or to get to it from lower level.
Solution is quite simple - you must go back and exit to street via ladder. This exit point is not marked on map, so check the screens I've uploaded (this is the same point where you entere tunnels for the first time).
Edit: If You want to go just for Enigma datapack, I suggest using entrance showned on images below. Entrance is in garage of building showned on the map below, you must knock out few swat-thugs and enter to sewers via hatch on the floor. Second screen is made on rooftop of the building where's the entrance.
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=190706777
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