Federal maritime, aeronautical and ground search and rescue components were involved in the operation.
Nineteen people were taken ashore by boat and transferred to hospital by land after participating in a mock disaster exercise off the western coast of Newfoundland.
The scenario provided an opportunity to test the Major Maritime Disaster Plan.
Two people remained in hospital on Friday after a mock disaster involving rescue and military personnel turned dangerous off the western coast of Newfoundland.
Coast Guard spokesperson Brian Stone said the training exercise, which involved a staged evacuation of a ferry, was interrupted when 25 people had to be rescued from a covered lifeboat after it filled with fumes.
About 48 different agencies and 400 people took part in the exercise. Feedback from all participating agencies will be gathered and analyzed in an effort to detect any flaws in their operating procedures.