Underground Undercover

Underground Undercover is a quest and achievement/trophy in Fallout 4.

Quick walkthrough
Infiltrate The Institute and meet with The Patriot.

Quest stages

 * 1) Talk with Tinker Tom
 * 2) Upload Encrypted message on any institute terminal
 * 3) Read Patriot's reply
 * 4) Meet Patriot
 * 5) Follow Liam
 * 6) Talk to Liam
 * 7) Talk to Desdemona
 * 8) Enter report on terminal
 * 9) Talk with PAM
 * 10) Get password for code defender
 * 11) Return to Desdemona
 * 12) Meet with Z1-14
 * 13) Give password to Liam Binet
 * 14) Give Z1-14 a day
 * 15) (Optional) Deposit weapons for rebels
 * 16) Kill tunnel guards
 * 17) Return to Z1-14
 * 18) Continue working for father

Bugs

 * It is possible that Desdemona will not initiate dialogue when trying to warn her about the brotherhood.
 * This may be caused by Glory being dead. To fix go to Railroad HQ and use recycleactor 000508EE and 000508EE.moveto player in the console.