Professor Nakayama has an urgent message for Jack, but the Lost Legion have him locked up. Head to the Hyperion Hub of Heroism and towards the waypoint on your map. Press the button to open the door and go into the Harren Lockup area, where some enemies will appear. When the coast is clear, attempt to free Nakayama from his cell to find the button won’t work.

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The door that leads to where Professor Nakayama is being held by the Lost Legion.

Nakayama says to go to the terminal and use that to open the door. After using it once or twice, a Dahl soldier chimes in and asks for an authorization code. Logically, you forgo this and decide to just shoot the terminal, letting Nakayama free. He asks you to defend him while he gets his message to Jack. Enemies will come from the top and bottom area to go after Nakayama and you. Once the message has finished uploading, hit the transmit button and talk to Nakayama to finish.