Lockdown

Lockdown is a cut quest in Fallout 76.

Quick walkthrough
This quest is mentioned in a terminal entry at Hunter's shack, which indicates that a woman named Hayley Porter has found a big secret at VTU.

Go to Vault-Tec University and find the holotape on Hayley Porter's corpse. Then go to each of the three vaults and obtain the three holotape key fragments: Vault 63 overseer's key, Vault 94 overseer's key, and Vault 96 overseer's key. Finally, return to VTU and use the keys to proceed past the laser grid and enter the classified Vault-Tec Data Archive.