Long, sausage-like strands of environmental booming could be seen on Toronto Harbour on Friday morning.
Toronto Fire crews put them there to suck up the oil that was spilled Thursday afternoon, after 26 people were rescued from a sinking tourist boat.
Calls for help came in around 4:30pm about a vessel in trouble in the icy-cold water.
The Toronto Police Marine Unit responded, along with Toronto's Fire's workhorse ice-breaking ship, the William Lyon MacKenzie.
Officials say she pulled alongside the disabled ship and the people on the tour boat made their way off.
No one was hurt.
Information officer Stephan Powell says the passengers were not in significant danger, adding that the tour vessel likely would have hit the bottom of the harbour rather than going under completely.
Powell says the disabled boat was towed back to shore and repairs were made to the leaking hull.
Environmental booms were placed in the water to clean up oil that leaked from the ship.
It is not known what caused the vessel to start sinking.
Authorities with Transport Canada investigating.