One last thought for August 1, 2005. I was browsing the Official Site of the U.S. Navy and happened across this story regarding the USS Nautilus, the world's first nuclear-powered submarine.
On this day in the year 1958, the Nautilus submerged beneath the Polar ice cap to execute the first underwater traverse of the North Pole. While this feat has been repeated many times since, and today icebreakers can and do successfully traverse the Passage, the Nautilus was the first ship to do it completely underwater. My congratulations go out to her and her crew.