"I couldn't really get past anybody that would spend the money that it would take to do it and keep an R rating," he explained, "Alternately, I wasn't really interested in pursuing a PG-13 version. Because the R rating is inherent. Little Sisters and injections and the whole thing. I just wanted to really, really make it a movie where, four days later, you're still shivering and going, "Jesus Christ!"... It's a movie that has to be really, really scary, but you also have to create a whole underwater world, so the pricetag is high. We just didn't have any takers on an R-rated movie with that pricetag."