Read MoreThe iconic waters of Venice, Italy have become an extreme threat due to frequent, massive flooding that has seen the city slowly sink for centuries. Now, a long-planned but controversial technology is being tested that could address the increasingly dire problem. Chris Livesay reports on the plans, and why they were not completed a decade ago.The iconic waters of Venice, Italy have become an extreme threat due to frequent, massive flooding that has seen the city slowly sink for centuries. Now, a long-planned but controversial technology is being tested that could address the increasingly dire problem. Chris Livesay reports on the plans, and why they were not completed a decade ago.