The largest cruise ship in the world has been labelled a floating "building site" by furious travelers on her first voyage. Harmony of the Seas, which cost $1 billion to build, embarked on a 4-night "pre-inaugural" cruise out of Southampton in England on May 22, ahead of her official maiden voyage to Barcelona on May 29.

Harmony of the Seas

Some of the approximately 6000 cruise passengers onboard the initial cruise have slammed operator Royal Caribbean, saying the vessel was "dangerous" and a "building site".

A Royal Caribbean spokesman said:

“The vast majority of our guests returned home very happy with their holiday on Harmony of the Seas.

“For any guests that have left the ship feeling disgruntled, we encourage them to contact our customer services helpline, where we will be happy to deal with each complaint on a case by case basis.

“Our customers are incredibly important to us and we are more than happy to talk to them and help resolve any queries".

For now, better watch Harmony of the Seas drone shots.