Once inside the sewer, head to the one door marked with a red exit sign that you can open.
On the far end of this room is another door with a glass window pane. If you look through the window, you will see a yellow junction box up on the wall. In order to shoot the box, you have to shoot the glass window at least 10 times or more to break the glass. Once the glass is broken, you can then shoot the junctioni box and enter the room.
At the far end of this room is another door with an exit sign that has a lock on it you can shoot. Next to the door on the left is a keybox that drops the Utility storage key that you need to unlock the door with the SHD Tech Cache inside it.
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