Nah. No Gas. I remember that map.

Basically you had to have like 20 medpacks on deck if you the type to search/salvage everything like I do.
It's called the 'New Antalya Apartments' and it's in the second map, like on the bottom.
I'm looking it up and it isn't DLC I think so you should be able to access it when you reach there if you aren't already.
In games like that I do all the side missions before forwarding the story, so the minute I got to the new map, I bounded my ass over there thinking I was going to just run through another run of the mill Zombie nest and clean up

. The ambiance of that place

along with the new monster in there had me

to the point I just took of them headphones, turned that shyt off and went to sleep.

If you played it you should remember it because the music alone makes it stand out....It's scarily beautiful, breh.