Question: Where are the operational headquarters of the cruise line on which Amber Hurst Martin has worked as a singer and actress?

<P0-S0> Amber Hurst Martin is an American singer and actress. <P0-S1>  Her first national tour was with "Jesus Christ Superstar" and she has also appeared across the U.S., the Caribbean and South Korea with Disney Cruises, "Sunfish The Musical" and the It Gets Better Tour. <P0-S2>  Her television appearances as a solo vocalist with the It Gets Better tour cast include "Dance Moms" and "I Am Cait". <SEP> <P1-S0> P&O Cruises Australia is a British-American owned cruise line with corporate headquarters at Carnival House in Southampton, England and operational headquarters in North Sydney, New South Wales, Australia. <P1-S1>  The sister company of P&O Cruises in the United Kingdom, it was previously a constituent of the Peninsular & Oriental Steam Navigation Company and has a direct link in history to the world's first passenger ships. <P1-S2>  As such, it is one of the oldest cruise lines in the world, and now forms part of the Carnival Corporation & plc, under the executive control of Holland America Line. <P1-S3>  It currently operates five ships, sailing from various ports in Australia and New Zealand. <SEP> <P2-S0> Majesty Cruise Line is a Norwegian cruise line probably known for owning the Norwegian Majesty from 1992 to 1997. <P2-S1>  Majesty Cruise Line was a more upmarket brand created by Dolphin Cruise Line in 1993. <P2-S2>  Their first ship, the Royal Majesty, was originally ordered by Birka Line for their 24-hour cruises out of Stockholm. <P2-S3>  Following the bankruptcy of builders Wärtsilä, the contract was resold to Majesty Cruise Line and the vessel was completed as Caribbean cruise ship Royal Majesty in 1992. <P2-S4>  She initially worked three- and four-night cruises out of Florida, but in 1995 opened a new summer Boston-Bermuda route, terminating at St George's rather than the usual Hamilton in Bermuda. <P2-S5>  Royal Majesty returned to Florida in the winter. <P2-S6>  In June 1995 she ran aground on Rose and Crown shoal of Nantucket Island, due to a combination of faulty GPS and inadequate watch being maintained. <P2-S7>  Royal Majesty was 17 miles off course. <P2-S8>  She remained aground for 24 hours before tugs towed her off. <P2-S9>  In 1997, a second ship was added to the fleet, the Crown Majesty (previously Crown Dynasty). <P2-S10>  For the 1997 season, she operated cruises which had already been arranged for Crown Dynasty, but at the end of that season both ships passed to Norwegian Cruise Line (NCL). <P2-S11>  Royal Majesty was sold to NCL, being renamed Norwegian Majesty, and soon received a similar lengthening to Norwegian Wind/Dream. <P2-S12>  Crown Majesty which had been chartered from Effjohn International, had her charter transferred to NCL. <SEP> <P3-S0> Disney Cruise Line is a cruise line operation that is a subsidiary of The Walt Disney Company. <P3-S1>  The company was incorporated in 1996 as Magical Cruise Company Limited and is domiciled in London, England, with their operational headquarters located in Celebration, Florida. <P3-S2>  The president, Karl Holz, will be replaced by Anthony Connelly in October 2017.