On this page of our guide to Wolfenstein: Youngblood you will find a detailed description of Data Tape side mission. This task involves obtaining a tape recording of General Lothar which is located in the interrogation center.
Who's commissioning the mission: Talk to Maria Laurent in a hiding place in the catacombs.
Use the subway network to move to the Little Berlin district. Set the described mission to active and follow the instructions on the mini-map.
You could have visited the Interrogation Center before during The Silent Outpost side quest. As a reminder, you must reach the opposite end of the wide street, where the exploration of the district always begins. The interrogation center building will be on the left.
Try to get rid of your opponents on the ground floor of the building. Do it quietly or in open battles. That way, they won't interfere with your search for the tape.
The search area shows the attached image. These are rows of boxes on the ground floor of a large structure with stairs.
The description of this task in your journal contains a hint which caches should be checked - in our case they were B-Gamma containers. It is worth noting that there is more than one box or container of each type. Open the B-Gamma crates as long as you will find the Interrogation Data Tape (picture 2). Go back with the tape to Mary in the catacombs.
Rewards: 7500 XP, 375 silver coins, 1 skill point.