The Nuclear Option (Railroad)

The Nuclear Option is a quest and Fallout 4 achievements and trophies in Fallout 4.

Quick walkthrough

 * 1) Talk to Desdemona
 * 2) Talk to Z1-14
 * 3) Kill everyone in relay room
 * 4) Talk to Desdemona
 * 5) Use terminal to override Institute lockdown
 * 6) Reach the reactor
 * 7) Plant fusion pulse charges inside reactor
 * 8) Talk to Desdemona
 * 9) Speak to Tinker Tom
 * 10) Step into relay
 * 11) Use the detonator
 * 12) Talk to Desdemona

Bugs

 * Teleporting into the Institute wearing the a power armor helmet with the Targeting HUD mod (or any other item with the Targeting HUD attached due to a mod) with this quest active makes the player partially hostile to the Institute, denying the player access to the elevator and not spawning any institute NPCs except Father. Reloading a save from before entering the institute for the final time and taking off the Targeting HUD mod is recommended, though the quest may be completable with copious abuse of tcl.
 * If the quest is never started (for example, if decided to destroy the Railroad instead), the rebel synths on the mining floor will still be there, non-hostile, standing and doing nothing forever.
 * After detonating, some players might experience the screen fading to black and eventually will be stuck loading the next cutscene. You use the console to relocate yourself to another location with the command (in this case, Red Rocket) and continue the game. Then type  to update the Mass Fusion building cell.