Getting out of a huge craft that has turned upside down can be terrifying. Smaller boats may right themselves. When a large vessel like a cruise ship or megayacht capsizes, prepare for the worst.
The first move is to find PFDs for you and every member of your party. Secure your life jacket first. Then help family and friends.
Follow emergency exit signs. Listen for directions. The captain and crew members have been trained for these situations.
Remain calm. Losing your cool will just contribute to hysteria. Take deep breaths if a situation becomes overwhelming.
Avoid the middle of the ship and anywhere dependent on electricity (such as elevators). Head to the deck where lifeboats are.
Jump in the water only as a last resort. Try to remain out of danger but on the ship for as long as possible. Typically, the longer you can stay out of the water, the better your chances of survival will be.