Notice the large icebergs floating in Mendenhall Lake at the base of Mendenhall Glacier. Witnessing them being created is very exciting. The process is called calving. First, there is a loud noise resembling an explosion. The sudden sound can be startling. Then, watch in awe as a massive sheet of ice and rock breaks off and slides down the terminus. As they plunge into the lake, huge waves are created. The chunks are submerged, resurface and spin. When the water settles, the iceberg begins its journey toward the Inside Passage.