SS Manhattan was an oil tanker constructed at the Fore River Shipyard in Quincy, Massachusetts, that became the first commercial ship to cross the Northwest Passage in 1969.

The Canadian sovereignty debate generated by Manhattan is being rekindled as multi-year decreases in sea ice, due to global warming, make further ship transits likely in the future.

A second attempt to cross the passage in winter proved impossible, and there were numerous environmental concerns with the project, so it was cancelled and the Trans-Alaska pipeline built.

Esso motivated for the use of models to optimize the ice breaking performance of the vessel, therefore the Wärtsilä Icebreaking Model Basin (WIMB) ice tank was built inside a converted air raid shelter in Helsinki, Finland, solely for this project.

Aker Arctic Technology, the Finnish engineering company that now uses the new ice tank thus owes its existence to the Manhattan project.