Stay in the side room of the tattoo parlor where you found Hannas body.
The panel is hidden on the back of the seat, as shown in the picture.
Input the code 3616 to unlock a secret room.
Start using alternative vision modes to make it locate and scan objects around you.
Your next main objective is to leave this secret room, as Daniel gets trapped inside.
For that focus on the control panel shown in the picture above.
The hook must grapple the grid.
Return to the control panel and now poke the arrow up button, as marked in the picture above.
That will force pull the grid and unlock access into the tunnel.
Jump in there and use Night Vision, as there is pretty dark down there.
A linear corridor will take you to the buildings basement.
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