Just went you think cruise lines can't get any more extreme, they go ahead and put a roller coaster on board.
Behold the Bolt Ultimate Sea Coaster. It's the first-ever coaster onboard a cruise ship and will debut on the Carnival Mardi Gras.
Bolt offers almost 800 feet of twists, turns and drops with riders reaching speeds of nearly 40 miles per hour.
The electric roller coaster holds two riders in a motorcycle-like vehicle to race along a track 187 feet above sea level with 360-degree views.
Carnival Mardi Gras will sail from Port Canaveral, Florida, in 2020.
(Editor's note: This story originally ran on Dec. 24, 2018.)