Being in a real submarine had been a childhood dream. So when I descended in the Atlantis XI Submarine Expedition I was very pleased. It isn't even that cramped and they even have air-conditioning and they keep the pressure on sea level so your ears are fine. We went up to depths of 100 feet and the water is so clear, you can see loads. As this was our honeymoon which you hope will leave you with long lasting memories, this was perfect because it did exactly that. My wife loved it too, so that was a bonus as well.