Ark Chest
Head north through the courtyard in the middle of the fortress, passing the roadblocks and climbing the concrete steps. Once at the top, head through the doorway straight ahead and enter the doorway on the right. From that room, enter the doorway to the next room to find the chest on the southeast side of the room.
Storage Containers
1. Storage Container
From outside the fortress, enter by heading up the steps and climb up the ladder on the left. Once at the top, take a right to find the storage container on a table.
2. Storage Container
From the previous container, keep following the path around until you come to the open section of the rail leading to the courtyard. Instead of jumping down, take a left and head down the stairs to find the container on the right on a table.
3. Storage Container
From the previous container, head back up the metal stairs and jump down into the courtyard to find the container on a metal box next to a roadblock on the left (west).
4. Storage Container
From the previous container, head back towards the ladder. When you come to the Goons and white skull graffiti on the wall, turn right to find the container next to a dumpster.
5. & 6. Storage Containers
From the previous container, head north through the courtyard, past the roadblocks and up the concrete steps. Proceed through the doorway straight ahead and enter the room on the right to find two storage containers.
Data Pad
Head north through the courtyard in the middle of the fortress, passing the roadblocks and climbing the concrete steps. Once at the top, head through the doorway straight ahead and enter the doorway on the right. From that room, enter the doorway to the next room to find the data pad on the right (northwest) side of the room.