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It's a slab, I'm also pretty sure it's post-tension, so I'm pretty sure it would be fine if I put something not too big under it.
Biggest issue would be having to x-ray it to make sure I don't cut any tendons if I do put the hatch in a closet.
Otherwise, I'll just have to put the hatch outside ;)

I know tons of civil and construction engineers, and would of course have them look at any plans first, for their opinion

Man.. this is exactly what I want to do under my foundation!

I figure a room or two would be nice for Z-Day. Store lots of nonn-perishable food down there. Sump pump for when I have power, hand pump for when I don't.
I think I'd definitely brace the walls a little better than he had, though.

Figure I'd saw cut an entry hatch from one my closet floors down into it... cover it with a rug. Would be perfect!