Samantha's Journey is a song featured in Black Ops 3 DLC Zombies Chronicles in the remastered version of Moon and is also included in the Zombies Chronicles dynamic theme.
In order to activate the song, the player must first go to the power room. By the Mystery Box location there are four speakers. Interact with them in a specific order. After interacting with the speakers a Samantha doll should appear on the left side of the MPD. Interact with it. After interacting with the doll, more of them will spawn in front of the MPD and the player needs to shoot them. After shooting all the dolls, the first doll will reappear. Interact with it once again and the player will be rewarded with a Max Ammo and the song will play.
'Zombies Chronicles' Samantha's Journey (Extended Mix)-0
Samantha's Journey Music easter egg