Exploded pots :(

I've been told pots can explode in the kiln if they are not bone dry....guess I didn't believe it and had to try it myself.....this is what'd happened when I opened up the kiln yesterday....exploded pots. Good that there were only 3 of them. I even preheated the kiln for an hour but then it still wasn't good enough. I guess I really should rush the whole process like my husband always tells me. Well, I'd learnt my lesson the hard way! :(