Tourists shelled out thousands of dollars to take the 104-day around-the-world vacation on the Sea Princess, which departed from Sydney, Australia.
"However, the threat, he said, was real and the ship must be prepared for a pirate attack".
Jasinski said that passengers were asked to sit on the floor and hold on to the railings in case the Sea Princess takes quick turns to avoid the pirate ships.
Deck parties, outdoor bars and movies were all cancelled and curtains and shutters were drawn at night.
"Captain Gennaro Arma addressed the ship", Jasinski wrote.
One of the most dramatic incidents happened in 2008 when the Nautica cruise ship was sacked upon by two pirate boats in the Gulf Of Aden, according to the IMO. "Bright lights, which normally signal the presence of the Sea Princess on the ocean, were dimmed or turned off altogether".
"It was made very clear on the Sea Princess, very quickly, that this pirate threat was not something to be joked about", Jasinski wrote in the essay published Monday.
"It is common practice for the master of a ship to take precautions against pirate attack if his vessel is on passage through a sea area where he considers that there is a risk of piracy", Austen told Condé Nast Traveler.
Once the crew notified the travelers - some of whom paid a reported $50,000 for the whole trip - they immediately began to take it seriously, Jasinski claimed.
Carolyne Jasinski, an Australian media specialist who often writes about travel, says passengers also went through drills to prepare for a plausible ambush at sea.
Travel at 60 contacted Princess Cruises for comment, but had not received a response at the time of publishing.
The ship could outrun pirates if necessary, the captain told crew members, but there were other options to keep the pirates at bay - officers were on duty 24/7, fire hoses were ready to be used and, as a last resort, a sonic boom could knock pirates off their ladders.
The compulsory drill saw holidaymakers sent back to their cabins so they could be counted by staff on the cruise.
"Any measures aboard Sea Princess were simply taken out of an abundance caution and not in response to a specific threat and are common to worldwide shipping sailing in the region", the spokesperson said.