At the end of the Fallout TV series, it's revealed that Hank MacLean nuked the NCR capital Shady Sands.
It raises some interesting questions. Is there a powerful cabal of Vault-Tec employees with a nuclear arsenal hiding in the wasteland, ready to wipe entire factions off the map? How did Hank, a seemingly low-level employee, gain access to such devastating weapons? And why did Vault-Tec attack the NCR in their decline and not their prime long before Hank decided to?
One fan believes that MacLean didn't contact a secret society of trigger-happy office workers hiding in the shadows, but repurposed a GECK instead.
Before the war, Vault-Tec developed terraforming kits known as GECKs which could be used to replenish the ravaged wastes, allowing for nature to thrive once again. In Fallout 2, we leave our tribe in search of one such GECK to save Arroyo. We also come across Vault City and Shady Sands, both of which were founded by vault dwellers who used GECKs to make the land more hospitable.
Vault 33 would no doubt have a GECK given its plans to rebuild society once everyone finally moved to the surface, but it's possible that MacLean used theirs as a weapon.
"My proposal is that Hank and his friends from [Vault] 31 modified the Vault 33 GECK into a bomb and then detonated it at Shady Sands," Stellar_Wings suggested. "I think it makes sense because we already know the devices can be extremely destructive if not activated properly, and they run on cold fusion which would explain why there's seemingly no radiation left from the explosion that destroyed the city."
This would mean that Shady Sands was created and destroyed by GECKs.
If Stellar_Wings is right, there likely isn't a group of Vault-Tec employees armed to the teeth who could obliterate anyone in their way. It would also mean that Hank acted alone in destroying Shady Sands, sabotaging a hotly sought-after Vault-Tec tool to do so. It still doesn't explain why he ventured to New Vegas at the end of
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