Why it costs $1 million a day to run one of the world's biggest cruise ships

• Royal Caribbean's Symphony of the Seas is one of the world's largest cruise ships.

• It takes a staff of 2,400 people working 24-7 to keep the ship moving.
• From tiny ship kitchens, they whip up 30,000 meals a day. And from the engine room and captain's bridge, staff power and move the ship. 

From the captain's bridge to the engine room, a staff of 2,400 works 24-7 to keep Royal Caribbean's Symphony of the Seas sailing.