 The conversion of "Manhattan" was a co-operation between Esso and Wärtsilä, a Finnish shipbuilding company.Wärtsilä Icebreaking Model Basin (WIMB), the ice tank built inside a converted air raid shelter in Helsinki, Finland, solely for this project, was later used for the company's own purposes until a new facility was built in the 1980s.Aker Arctic Technology Inc, a Finnish engineering company that specializes in the design of icebreakers and operates an ice model test facility, thus owes its existence to the "Manhattan" project.