I don't know if this is old news but there are 3 movie posters in Studio the titles are as follows:
Iron Shadow Killers (From the deep orient comes your worst fear)
Space Monsters from the Moon (Beyond the lie the monsters from space)
Beast from Below (The Oceans worst predator just found it's new prey man)
Well in zombies we've been to the deep orient (Die Rise)
we've been to the moon (Moon)
However we have not been under water or anything water related so could they be hinting towards the next map