Cunard Ambassador (and sister Adventurer) were originally intended as two of eight similarly designed ships for Overseas National Airways.
Due to the vast amount of money being put into this project, Overseas National Airways ran into financial troubles, and had to abort their project.
Cunard saw the opportunity to use the already designed vessels to enter the cruise market, and quickly took over the project.
The (planned) eight cruise ships were soon reduced to only two. Cunard Commissioned the two new ships the Cunard Adventurer of 1971 and Cunard Ambassador of 1972.
Cunard Ambassador along with her twin sister, were intended for seven-day cruises. Some of these cruises included New York to Bermuda, San Juan to other Caribbean ports, and Vancouver to Alaska during the summer seasons.
Cunard Ambassador was pulled out of Cunard service on September 12, 1974 after a fire on a positioning trip. There were no passengers on this trip, and there were no fatalities involving the crew. After being towed to Key West, she was declared a total loss.
Despite being declared her a total loss, she was purchased from Cunard (as a gutted hull), and was refitted to become the Danish sheep carrier, Linda Clausen.