The city 17 is still in battle against the combine and the city is evacuated by the Citadel destroy, Gordon Freeman does not know if there are any dark places in the city like for example the tunnel, find the exit of the light to evacuate the city 17.
You should work on making this room smaller and adding some more props to it, this here looks too empty and too big, and reminds me of some Half-Life 1 mods.