[multiple spoiler alert]
Early in the game there's a side mission "Cloak and Daggers" that has a secondary objective, "Remain undetected while in DRB territory." Eventually I gave up and just went in guns-a-blazin', but I'm wondering whether I missed a sneaky entrance.
I found three ways in:
The main alley leading into DRB land. The main entrance is protected by a couple of thugs (instant detection). There's some rubble and a concrete pipe immediately to their left that I tried sneaking through, but it was such a frontal entrance that I always triggered somebody's alert.
Moving down the street to the left (left as I face the alley) I come to some stairs in an alley that take me to a rooftop with sneaky access to the DRB zone, but requiring a 15' jump across to a DRB fire escape. With leg augs I'm sure I could make that jump, but without them I kept splatting in the alley below. Rather than jumping I tried leaving the roof by walking along some vent-work to the left, but could never make it from the vents onto the DRB fire escape.
Still further left down the main street is a door that leads to a tunnel with DRB access. It's blocked by large crates, and eventually I bought the Lifting aug to get through this way, but there are a couple of thugs here that always detected me.
Am I missing another way in? Or can I get in undetected through one of these entrances without the leg augs?