The Molecular Level

The Molecular Level is a main story quest and achievement/trophy .
==Quick walkthrough==
==Detailed walkthrough==
At the end of The Glowing Sea, Virgil reveals that the Institute uses teleportation, and that this could be intercepted using information from a courser chip to construct a device, the signal interceptor. Before the Sole Survivor can utilize the newly acquired courser chip, it needs to be analyzed by someone familiar with the Institute's technology. The only person capable of doing this is Tinker Tom of the Railroad. If the Railroad has yet to be encountered, Dr. Amari will advise the player to follow the Freedom Trail to find the hidden Railroad HQ.
Once at Railroad HQ, speak to Desdemona and agree to her terms. Give the courser chip to Tinker Tom, who cracks the encryption and provides the code for the chip. If the Sole Survivor is an enemy of the Railroad before then, use Tinker Tom's terminal and select Decoding Institute Tech for instructions. This will allow the player to use the circuit analyzer to decode the chip and proceed along with the quest.
Return to Virgil. He offers the plans for the signal interceptor but now reminds the Sole Survivor of the favor that they promised him in their previous agreement: if the teleporter works, they must retrieve a serum from Virgil's old laboratory inside the Institute to cure his FEV affliction and make him human again. Accept his terms and receive the plans. However, the signal interceptor is no simple machine: expert help and a lot of resources are needed to construct it.
At this point, the Sole Survivor needs to make a choice to enlist the help of one of the three major factions (the Minutemen, the Brotherhood of Steel, or the Railroad). Speak to either Proctor Ingram (BoS), Sturges (Minutemen), or Tinker Tom (Railroad) and arrange for the construction of the teleporter. The chosen expert then travels to the building site and explains the requirements and necessary materials for each of the four components: the reflector platform, beam emitter, control console and relay dish.
The player can build the signal interceptor in the majority of allied settlements, including Boston Airport if they are allied to the Brotherhood. Note that both Home Plate and settlements from add-ons are excluded. Even though the Railroad suggests building it at Mercer Safehouse, one is not required to do so.
===Constructing the signal interceptor===
Build the stabilized reflector platform first in the target settlement, then speak to either Ingram, Sturges or Tom. Either of them gives the Sole Survivor the second list of resources required to complete the signal interceptor and will travel to (or spawn at) the settlement where it is built.
If building with the Brotherhood's help, Elder Maxson's permission is required before activating the signal interceptor. He moves from Boston Airport to the chosen settlement and might camp at allied settlements for the night along the way (he will be tagged on the Pip-Boy for his entire journey). 
Requirements for the teleporter:
* Enough flat surface area without any obstructions (the emitter needs to be built upon the platform, the combined structure - including a fusion generator to power it - can be squeezed in a 2x2x3 space).
* Enough "size" allotment remaining at the settlement (the teleporter is quite large).
* It requires 27 power.
* The components have to be linked together with power cables on the same network.
* For additional details regarding the construction of the signal interceptor, see its page.
When everything is built, linked together and supplied with enough power, the teleporter is ready for use. Talk to the expert and get ready for the voyage. The expert (of the assisting ally faction) instructs the Sole Survivor to stand on the platform, they are given a faction-dependent holotape, and then the teleportation process will commence.
==Quest stages==
==Notes==
* Building the components at a different settlement than suggested may cause the quest giving NPC to travel, teleport or spawn there.
* Both the Minutemen and the Railroad builds of the signal interceptor will cause the beam emitter to have one of its pipes burst in the middle of the launch. Regardless of how worried the technician might sound, this will have no effect on the result. In contrast, building with the Brotherhood of Steel won't have this issue and everything will go smoothly.
* If one is not allied with the Railroad before visiting the Institute, and leaves there on friendly terms, the Railroad will no longer trust the Sole Survivor and will not let them join their faction. Along with story considerations, this may mean that one will never be able to build ballistic weave for the clothing.
* In order to build the interceptor with the Brotherhood of Steel, one must complete several of their quests up to Show No Mercy, finishing the tasks for Elder Maxson. Then one is able to speak to Proctor Ingram to offer help.
* In order to build the interceptor with the Minutemen, Preston Garvey will ask that the Sole Survivor first check with Sturges and complete Sanctuary when The First Step starts.
** However, if Nuka-World is installed and the Sole Survivor becomes the overboss of Nuka-World prior to completing When Freedom Calls, then Preston Garvey will no longer work for the Sole Survivor and build the interceptor with them, bringing the Minutemen questline to a halt until they become an enemy of the Nuka-World raiders, giving an opportunity to start Open Season.
* In order to build the interceptor with the Railroad, Desdemona will ask the player to complete Tradecraft and join the organization. She will discuss the interceptor once Road to Freedom is completed, but will not agree to help with its construction until Tradecraft has been completed. It is not possible to interact with Tinker Tom either until Tradecraft is complete.
* If building the interceptor with the help of the Railroad, all the items required to construct the components (apart from the two specified items biometric scanner and military-grade circuit board) will already be deposited in the Mercer Safehouse workshop. Tinker Tom mentions that he will sort runners to get the components there ready. This happens twice, once for the reflector platform stage, and then again for the signal interceptor stage. It includes sufficient materials to build six medium generators, enough to power the device.
* If building it with the help of the Railroad one may need to allow sufficient time for both Tinker Tom and Desdemona to get to the location of the Mercer Safehouse once the reflector platform is built and the quest log progresses. The map may show Desdemona's current location which keeps moving as she walks to the site if they have not reached it by the time one gets there. Waiting or sleeping for several hours should allow them to reach it and take up their positions close to the teleporter.
* When stepping on to the platform, a holotape will be given. The Minutemen or Brotherhood will give the network scanner holotape. For the Railroad Desdemona will give the encrypted message holotape which will in this case also include the network scanner function.
* If the player has already asked a faction to help in building the signal interceptor, it is possible to reset this quest branch point, provided that construction has not yet begun, or if the player is currently able to trade with the current faction's technical expert, and then kills them or turns them permanently hostile.
** For example, the player is allied with the Railroad, then returns to Tinker Tom and trades with him to buy back the interceptor plans for no cost. After this, they kill Tinker Tom, which will turn the Railroad hostile. However, this allows the Sole Survivor to ask the other factions (Brotherhood of Steel or the Minutemen) for help with building the transporter.
* Despite being marked as optional in the quest stage log, both the biometric scanner and military-grade circuit board are in fact required in order to construct their respective teleporter parts and progress the quest. The sensor module is not required for any of them currently. If one already has any of these in the selected settlement workshop (or carried at the time) then they will not be included in the quest stage log details.
* In the Fallout 4 Vault Dweller's Survival Guide, the quest has a fourth option called "Misanthropic Moxie," that is, to build the teleporter alone at any desired settlement without the aid of any faction. However, this option is not available in the game. The publisher of the guide, Prima Games, has acknowledged the mistake.
* Sometimes, if the player has not already joined the Railroad, Desdemona cannot be interacted with. To correct this, simply head into the HQ itself and wait. Desdemona should follow. Talk to her, then return to the initial meeting point (and talk to her again) to complete joining the Railroad.
==Bugs==
Category:Fallout 4 quests
Category:Fallout 4 achievements and trophies
de:Die Molekularstufe
es:El nivel molecular
pl:Poziom molekularny
pt:O Nível Molecular
ru:Молекулярный уровень
uk:Молекулярний рівень
zh:分子世界