The line received criticism from customers about the level of work still being carried out during the voyage, which departed Southampton on May 22.
Royal Caribbean is also offering all passengers a certificate giving them a 50% discount on the fare for a future cruise booking.
“On a ship of such scale and complexity we were hopeful that all work would be completed in time for our first voyage, however we recognise that there were still simply too many projects being completed during this sailing,” said the company in a statement.
“We offer our sincere apologies to all of our valued customers who were affected by this. The satisfaction of our customers is extremely important to us.
“We are eager to welcome our guests back onboard and to deliver the experience that is anticipated and expected of a Royal Caribbean holiday.”
Royal Caribbean apologises over Harmony cruise
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