Dark Interval is a total conversion mod, the new incarnation of the Original Storyline of Half-Life 2. You can find your way through the nightmarish world of devastated Earth. Starting from the suburbs of City 17, then continuing through the alien factories, the underwater base and the Citadel, you can feel that dark atmosphere of the Original Storyline. Development started on Apr 10, 2010.
I felt like experimenting with the skybox a little. Personally, I find the reddish/dark purple sky fitting rather well; what do you think? Perhaps it's too clear?