I know Criss Angel's tricks aren't real but how does he do it?

How does he do it??? I know for the woman 1/2 trick he used Rose Siggins or wat ever her name is but how did he do his other tricks??? Like: walking on water w/ peeps swimming under him or levitating from building to building???? Like i know he had a video showing how he levitates but.. that wouldnt work in the air!!!!! Is there a website that answers my question???? Or do you know the answer?!?!? thanks!