The boat was a few miles from the glacier, when I heard what sounded like thunder. As I approached closer to the glacier, the thunder sound was more distinct. I soon learned was caused when the calving glacier hit the water. I tried taking photos of the calving glacier, but my problem was that the glacier was deceptively large, about 150 feet tall and over a mile long. It appeared that the boat was a few hundred feet from the glacier, but in reality we were still a mile away. Every time I heard the thunder sound, I would point my camera in that direction, but because we were still so far away, the glacier had already hit the water 5 seconds ago. Finally, I got close enough to photograph these huge chucks of ice, many the size of a two story house, falling into the bay.