My first thought was that it was a shoop. This just happened 22 May

Link to one of the articles is Here . my title Rule is a quote from the guy who’s garden this ended up in

Another great quote was statement from the shipping company

NCL’s chief executive, Bente Hetland, said “Incidents like this should not happen"

I would just like to point out that this is not typical

Current theories are that a wave hit the ship