This mod was originally created and uploaded back in 2014 by Lonely Traveler. Don't expect references to The Penumbra series because this quest has little to no connections to this franchise. Penumbra games were more like an original inspirational idea for creator, so they have similarities only in "dark mood" and, well, "underground facility".
Even though, this quest looked very promising and unique, it had dozens of bugs, one of which "softlocked" many users before even finishing first part of the quest. So now, after almost 9 years, I fixed many minor and big issues and translated this decent quest to English language. 
So, you know the deal, right?

WHAT TO EXPECT
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1) New unmarked quest which consists of two "formal" parts: first - "key/notes" gameplay structure, second - maze type dungeon with big rewards and huge enemies;

2) Potential new player house in Canterbury Commons;

3) Around 1,5-2 hours to complete quest;

4) Custom ambient/horror soundtrack in the Penumbra facility;

5) In second part of this quest there are several optional "challenges" in the facility, so don't hesitate to explore and check all available doors and containers;

6) No PuceMoose's style of puzzles, trust me;

7) One new weapon type as a main reward for this challenge;

HOW TO INSTALL
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Original creator left full permissions to modify and re-upload his quest, so you'll only need files from this page.
Also if you'll stuck in the first "key/notes" part or just really hate this kind of gameplay structure, check Files "Miscellaneous" section for optional translated walkthrough. It contains step by step guide for the first part of the quest (before entering Penumbra facility). 

1) Place the .esp and other folders in the Data directory of the game 
2) Activate the dom ESP file and run the game.
OR
1) Just use Vortex installation path and activate plugin.

HOW TO START
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You need to find first note near the Vault 101 door (interior location, not exterior!). You can find screenshot of this note in the "Images" section of this page.

Also this mod is balanced for mid-game players, you will need at least 50 - Science and Lockpick skills. Minimum player character level for balanced experience in combat stages - 15. 
Don't bring companions in The Penumbra Facility after first part of the quest. 

BUGS AND CONFLICTS 
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WHY REMASTER??
I fixed all "game breaking" bugs and minor issues that I found in my 3 play-testing playthroughs (changes in values, weight adjustments, names, enemies placement, incorrect damage and HP configurations, put notes in more proper and accessible places and so on).
So this quest is absolutely playable from start to finish, but you can expect some small bugs like floating notes and clutter sometimes. 

Also original creator forgot to put first note in separate Vault 101 entrance interior (which player will visit after "Trouble on the Homefront" quest, yes, in the game files there are 2 of them), so you could've only find it if this vanilla quest didn't already started. Now you can start this quest whenever you want.

But the main point in this "Remaster" was to fix "softlock" bug which prevented many "original version" players from entering Tom's House location. So in my version I made a separate access hatch to finally get in this location without any problems. So, please, follow my translated walkthrough for more details.

CREDITS
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My deepest gratitude to Lonely Traveler for creating this quest mod.
All rights and praises only to original modder.