The Johns Hopkins Glacier, named after the university in Baltimore, is typically closed to cruise ships in order to protect wildlife habitat in Glacier Bay National Park. Melt-water from this mile-wide glacier often emerges from below the surface causing tunnels or caves like the one in the photo. Sometimes the water squirts out like a giant fountain. Imagine this 250 foot wall of ice, equivalent to a 25 story building, moving about 3,000 feet a year. That’s eight feet a day.