Ever heard of the game Metro?
I always found a little bit sad that it wasn't open-world. Here's a Survival/Challenge/Whatever map for you, which requires some mods (which are attached.).

NOT FINISHED.

UPDATE LOG 30/03/19
I really don't know wether I'm ever going to complete this or not. I found my old planet minecraft profile after about 3 years, so welp... here I am? I'll try to get some progress back and catch up with me 3 years ago, and we'll see.

UPDATE LOG 02/04/19
Yo. I'm back? Semi-back. After sort of being busy for 3 years I started working on the map again and noticed how mich fun it actually was to do that. So, here is the next update (which is huge.). There are mods attached to the downloadable file, so don't worry about a thing. Just get a 1.10.2 Forge Profile for your minecraft and a specific texture pack (more in the README).

Also, if the mods don't work, give me feedback.
Also, if the map is too hard, give me feedback.
Also, civilians with names above them most of the time have something interesting to say.
Also, have fun I guess.

(Yes I know update logs have a specific feature here on planetminecraft, but hey, saying I'm back after 3 years sort of deserves to be in the main description. Sry.)

IF ANYTHING IS UNCLEAR OR NOT WORKING, FEEDBACK ME. DO IT.