Friday, January 17th 2048, Berlin, Sector 12, Communication Port State of Mind Guide and Walkthrough
Last update: 15 October 2018
You will once again be in the communication port (which changed in appearance a lot). Head straight ahead - up to the ramp on the left side. Get up the ramp and march to the end of it, but do not enter the main doors (through which Richard previously entered the hall)
Turn left from the doors and head to the subway. Go down - you will reach a place where the passage to the right is blocked and the entrance on the left side required an access code. Try to open them and hack their mechanism (a mini-game with the two balls, where you need to create a single one of them).
Once you are through the open doors, you will reach a place where, on the wall above the sewer hatch, there is a sign that Richard watched on the plans found in the documents received from Walter (you have those plans in the inventory). Open the hatch and the characters will enter the tunnel.