Underwater Restaurant

This is an underground restaurant in New Zealand. I planned on going to New Zealand someday anyways, but seeing this and reading the article about it gives me even more incentive to go. I'm going to have to strike it rich or take someone with me who's filthy rich because lunch here costs between $120-$150 and dinner is between $200-$250. A little steep if you ask me. What i really want to know, and they didn't explain in the article, is how do you get down to it and how do they open up the door and not let water in? There must be some sort of hightech elevator system going on because it's a good 30 feet underwater. Cool, huh?