Dark Interval is a restoration/revision mod that lets you play Half-Life 2 as it could have been. Using Valve's early concepts, we're creating new maps, models, textures, and custom dialogue. The mod is released in episodes, the most recent being Dark Interval: Part I - an intro chapter to the bigger story.
Underground tunnels stretch beneath the city, home to dangerous life forms and strange Combine creations.
So, Hydras?
Not yet, that would be an overkill for first chapters of mod.
Looks a bit plain, maybe add some grunge to the walls? Other than that, looks awesome, and that bright light to the center left does a great job of bringin the players attention to the doorway.