World's largest cruise ship which is a third longer than the Titanic leaves port for the first time as it sets sail from France with no passengers (but still needs 500 crew)

Harmony of the Seas, which cost almost £0.8billion to build and weighs 227,000 tonnes, was helped from Saint-Nazaire port by six tug boats this afternoon.

Although there's no passengers on board yet the ship, which is nearly 330 foot longer than Titanic, has aboard around 500 crew as its continues its sea trial until Sunday. 

Even when it was miles away from western France the 210 feet tall ship, with capacity for 6,000 passengers, could still be seen from the shore line as thousands of people gathered to see it on the water for the first time. 

For months, tourists have been allowed on board to wonder at the luxury interiors of the ship that has 18 decks and stretches to 1,187 feet. 

Three pilots who have trained on a simulator in nearby Nantes for the past year, helped the captain in the tricky manoeuvres needed to guide the hulking ship out of the Saint-Nazaire estuary.