AmaWaterways AmaMelodiaDecks: 3Passengers: 64 Crystal Crystal SerenityYear Built: 2003Refurbished: 2023Passengers: 740Size: 51,400 tons Royal Caribbean International Serenade of the SeasYear Built: 2003Refurbished: 2012Decks: 12Passengers: 2,476Size: 90,090 tons Silversea Silver ShadowYear Built: 2000Refurbished: 2017Decks: 7Passengers: 388Size: 28,258 tons