Cruise ships are flocking to Alaska to chase ice. But receding glaciers are leaving a new threat behind

It was a very early morning in August when an entire mountainside in Alaska’s Tracy Arm fjord detached and slid into the deep ocean water beneath it.

​ It was a very early morning in August when an entire mountainside in Alaska’s Tracy Arm fjord detached and slid into the deep ocean water beneath it. Read More Breaking News, Latest News and Videos | CNN