Cleansing the Land

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Cleansing the Land is a quest and achievement/trophy in the Fallout 4 add-on Far Harbor.

Quick walkthroughEdit

Far Harbor quest: Cleansing the Land
Locate the Nuclear Launch Key
Listen to Safe Room Security Tape
Obtain the Nuclear Launch Key
(Optional) Speak to the High Confessor about the Nucleur Launch Key
Use the Launch Key to Destroy the Nucleus
Escape the Nucleus

Detailed walkthroughEdit

Cleansing the Land is a quest that requires the Sole Survivor to destroy either Far Harbor by utilising the Wind Farm kill switch code, or by using the nuclear launch key and thus destroying the Children of Atom at The Nucleus. Although destroying one of the two faction finishes the quest and grants the achievement Cleansing the Land, the player can still choose to destroy both factions.

Both codes needed for the destruction are obtained in the previous quest Best Left Forgotten.

When choosing to destroy Far Harbor the player can optionally give the nuclear launch key to High Confessor Tektus. Do note that by doing this the player can't go back and destroy the Nucleus as well should they desire so. Tektus will praise the player, but then urge them to destroy Far Harbor. To do so the player will have to visit the Wind Farm Maintenance and enter the kill switch code in terminal 2. This shuts down the wind farm, killing off the electricity needed to run the fog condensors around Far Harbor. As a result, Far Harbor will be engulfed in the fog and the creatures that come with it. A message will be displayed at this point that you are now enemy of Far Harbor. After activating the code and returning to Tektus, the player will receive Atom's Bulwark and the title 'Inquisitor', along with the perk Inquisitor of Atom as reward. Far Harbor itself will turn into ruins covered in fog and overrun by creatures, a legendary Fog crawler being amongst them. Almost all Harbormen are dead, with only a few making a desperate last stand.

When choosing to destroy The Nucleus the player will have to insert the nuclear launch key in The Vessel. Doing so will turn all Children of Atom hostile and will initiate a 30 second countdown upon which the submarine will go into lockdown, followed immediately by the launch of the nuclear warheads. The player has 30 seconds to leave the Nucleus. Once outside the building the player will be safe from the explosion. After the Nucleus exploded the player will be given the perk Far Harbor Survivalist. Upon returning to Far Harbor there will be a commotion, with Harbormen gathering around and Captain Avery announcing that there was indeed a nuclear detonation and that all Children of Atom are dead. Allen Lee will react happy about the news, but Avery will insist upon a moment of silence. When talking to Allen he will call the player a hero and reward them with 1600 caps.

Quest stagesEdit

StageStatusDescriptionLog Entry
10 Locate the Nuclear Launch KeySeems DiMA uncovered the location of the launch key for the submarine in the Nucleus. I'll have to get into the safe room in the Harbor Grand Hotel. Luckily, I've got the code - 485130.
20 Bring Down Far Harbor's Defenses OR
Confront DiMA about the Wind Turbine Kill Switch
I recovered the code to activate the kill-switch installed in Far Harbor's wind turbine. I suppose I could either confront DiMA about this... or I could just pay the maintenance shed a visit. OR
I recovered the code to activate the kill-switch installed in Far Harbor's wind turbine. If I want to use it, I'm going to have to pay a visit to the farm's maintenance shed.
120 Listen to Safe Room Security TapeAppears the Harbor Grand Hotel safe room had an old recording system. Maybe it can point me to the launch key.
130 Obtain the Nuclear Launch KeyThe launch key is hidden on a boat at Fringe Cove docks. Safe combination is 44, 6, 75, 12.
150 Use the Launch Key to Destroy the NucleusI've found the launch key that could destroy the Nucleus. If I use it, it could change the future of the whole island.
Confront DiMA about the Nuclear Launch Key
210 Escape the NucleusI triggered the countdown to launch the nuke! I need to get out of the sub bay! Why am I reading this?!
250Quest finishedIcon checkIt's done. The fate of the island has been decided. The Nucleus is no more.


  • Finishing this quest will fail the quest Safe Passage.
  • Before destroying the Nucleus, players may wish to purchase the Recon Marine right arm and -left arm, two legendary pieces of Marine armor, from the vendors there.
  • The holotapes, notes, logs, etc. encountered while obtaining the launch key tell a story with implications of the cause and beginnings of the great war.
  • If you finish the quest Reformation you will fail the optional Talk to the High Confessor about the Nuclear launch key, as it is directly tied to the final stage with destroying The Nucleus.
  • In turn finishing this mission will fail Reformation completely.
  • If the player previously convinced Uncle Ken to return to Far Harbor during the quest The Hold Out, and then destroys Far Harbor and enters The Last Plank, Uncle Ken may be found fighting an Angler. Despite all Harbormen being aggresive towards the player, Uncle Ken will not act hostile but will not comment or acknowledge the destruction of Far Harbor either.


  • ps4Icon ps4 Choosing to use the launch key and then staying in the Nucleus to watch the launch may crash the game.[verification overdue]
  • pcIcon pc ps4Icon ps4 Confronting DiMA about the wind turbines or the nuclear launch codes might not be possible, despite him being an active quest marker. May be it is caused by Reformation already in progress. [verified]

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