Completing the Cambridge Polymer Laboratory Quest in Fallout 4: A Guide

Once there, chat with Molly and follow her into the meeting room to listen to the briefing. Then go to the laboratory and the quest will activate, blocking you in the decontamination zone. To avoid taking too much damage, move forward into the opening on the right to get out of there.

Collect samples

Your quest for samples then begins and the first, No. 11317, is located near the terminal on the right in the next room. Then go to the room behind and then to the one furthest to the left afterwards. On the bookshelf, you collect the dry suit and sample No. 3111.

Then enter room C4, collect sample No. 413 and go through the hole in the wall. In this new room, collect sample No. 65 and use the terminal on the right to lock the isotope containment room. Then go up the stairs to reach the upper floor.

Once arrived, turn right and pass over the chairs to arrive in the room on the left where sample No. 49 is on the desk. Then go up through the hole in the ceiling. You arrive in conduits, turn right, then left. Then drop down and collect sample #611 near Bergman's computer.

Use the terminal to unlock the door and go back down to the central area. Put on the suit recovered earlier and enter the isotope containment zone. Eliminate the luminescent and collect the U-238 isotope from the shelf at the back.

Start the crafting procedure and complete the quest

You have now collected everything you need and all you have to do is return to the quest marker. There, insert the samples into the slots so that you can identify them. Once it's done, insert the lithium hydride and gold into both compartments.

Be careful, there is a bug that causes lithium hydride to bug if you remove it, So don't touch it once it's in place! Then insert the isotope on the right and use the computer to start the manufacturing procedure. Then collect the breastplate. All you have to do is return to the decontamination room and speak with Molly.

She then unlocks the door for you. Follow her to the principal's office and kill the ghoul before talking one last time with Molly. Once that's done, you're officially done with this Cambridge Polymer Lab quest in Fallout 4!

Alternative Solution for Cambridge Polymer Lab Quest

Before leaving us, know that there is an alternative solution for this quest. When you are in Bergman's office, you will be able to use your computer to activate the defense system. By doing this you open all doors in the complex.

Be careful though, because even if you will succeed in the optional objective by doing this, Molly won't really like it and will attack you. You will then have no choice but to destroy it. So see if you want to do it or keep her alive.