cocaine worth 4$480 million, th biggest bust in coast guard history. it was spotted by a navy plane in the pacific last month. the video just released. this was blue so it would blend into the water. you can see the exhaust pipe and cockpit. they re very difficult to see. the semi submersibles have become a favorite of cocaine traffickers that began using them a decade ago. they re now thought to carry as much as a third of all illegal drugs smuggle into the u.s. by sea. pete williams, nbc, washington. the political debate lit social media on fire last night. we ll tell you what got the most attention. that s next. it took serena williams years to master the two handed backhand.