The quest Best Left Forgotten serves as a central turning point in Fallout 4's Far Harbor expansion. Players are tasked with uncovering DiMA's hidden past by infiltrating a guarded facility and extracting encrypted synth memories. Completing this mission requires a mix of combat readiness, spatial puzzle solving, and major story choices that shape the future of the island.
Accessing the Mainframe inside The Nucleus
To begin the operation, players must venture deep into The Nucleus, a heavily guarded submarine base controlled by the Children of Atom. Accessing the mainframe requires navigating through hazardous corridors filled with laser tripwires, automated turrets, and hostile synthetics. Once you overcome these perimeter defenses, activating the auxiliary power terminal restores the central server and unlocks the memory simulation interface.
Solving DiMA's Virtual Reality Puzzles
Inside the virtual mainframe, players encounter five distinct memory simulation puzzles that demand tactical block placement. You must manipulate code blocks and redirect laser beams to clear firewalls while deploying defense turrets to protect data indexers from defensive programs. Retrieving all five memory files gives players total insight into DiMA's long-buried secrets, though completing just the initial memory provides enough core evidence to advance the main story.
Uncovering Secrets across Far Harbor
After retrieving the data holotapes, your objectives expand to investigating key locations marked across the island. These secrets include finding the nuclear launch key at the Harbor Grand Hotel, discovering the wind farm kill switch code on a remote island, and revealing a hidden medical facility under the Vim Pop Factory. Unearthing these items exposes critical secrets regarding the factions competing for control over the region.
Determining the Fate of the Island
Confronting DiMA with his recovered memories presents several branching diplomatic or destructive outcomes. Players can choose to keep his secrets to preserve a fragile peace, report his actions to local authorities, or use the recovered codes to wipe out rival factions entirely. Your final decisions during this quest directly influence which endings become available as you resolve the conflict.
