Digging up the Past
Digging up the Past is an achievement in Halo 4. It is awarded when the player finds and accesses John-117's record during the level Dawn. The achievement is worth 20 Gamerpoints. It is represented by the Office of Naval Intelligence emblem.
The location of the terminal is located right under the cryo bay. In the beginning of the level, instead of heading straight into the room where there's a hologram of the frigate, turn left and look for a staircase that leads to the lower floor. At the far end of the room, there is the terminal that contains John-117's service record.