Hm... [A thoughtful hum as he cuts more chicken. He hasn't lost track of that task yet] Supposedly, this is all that remains of the world as it once was. Maybe the rest is unstable.

[After that time recruits were transported to the wrong place and seeing how it was collapsing in on itself, Haise could believe that. Of course, there remains another possibility]

Though it could also be that there's something they just won't want us to get into.