Mega-iceberg A23a, formerly the world's largest, turns into bright 'blue mush' as it finally dies after 40 years at sea

New satellite photos reveal that one of the world's largest and longest-lived icebergs, A23a, has developed vibrant blue striations on its surface. The striking snaps hint that the "megaberg" will soon disappear forever, ending a surprisingly eventful four-decade-long saga.