Oceania Cruises is set to undergo significant changes over the next few years with the debut of newbuilds and the retirement of its older vessels. SirenaCapacity: 684Tonnage: 30,200Year Built: 2000Fate: Sold to undisclosed buyerFarewell Cruise: March 24, 2028Norwegian Cruise Line Holdings announced the sale of the Sirena in late July. NauticaCapacity: 684Tonnage: 30,200Year Built: 2000Fate: To become Oceania AureliaFarewell Cruise: October 15, 2027The Nautica will remain in service for Oceania Cruises after undergoing a significant refurbishment in late 2027. RegattaCapacity: 684Tonnage: 30,200Year Built: 1998Fate: Chartered to My CruisesFarewell Cruise: August 17, 2026The Regatta will leave Oceania Cruises’ fleet this year having been chartered to My Cruises’ Explorations by Norwegian brand. The 30,200-ton ship was previously slated to be withdrawn in 2027 to become a residential cruise ship for Crescent Seas but the plan later fell through.