User blog comment:Gearslover01/Possible Easter Egg for new BioShock game?/@comment-99.254.72.247-20130810045839

I agree it was probably something cut from the game and left in. In an interview Kevin said they have no desire to return, because it would be "too easy" to do Bioshock Underground. I also think since SystemShock was in space they wouldn't go there either. I honestly hope they create a new awesome IP with new mechanics, gameplay but keep similarities to Bioshock and the great storylines.