The Onondaga project is a project of the Pointe-au-Père Maritime Historical Site (SHMP), a museum located in Rimouski, Quebec, Canada, to convert HMCS Onondaga, a submarine of the Royal Canadian Navy, disarmed in June 2000. Launched by the Canadian War Museum (CWM) in 2000, the Onondaga conversion project was abandoned by the museum in 2002 due to a lack of funding. The SHMP, which has been interested in a museum submarine project since 2000, is conducting a feasibility study in 2003 demonstrating the potential for profitability of the project and acquired Onondaga in 2005.
In 2006, the SHMP began working with governments to finance the project and meet environmental requirements. It also identifies the submarine installation site, parallel to the Pointe-au-Père wharf. This choice entails an increase in installation costs, forcing the museum to reduce the concept of the exhibition and to develop a haulage method using a rail to reduce costs. The SHMP finally gets financial support from governments in early 2008.