 It was one kilometer in length, and was primarily intended as a test vehicle, to research the loadings and responses of such installations.This project was substituted as a study project to provide more definite information about a proposed floating runway at Kansai International Airport, which was not built (an artificial island was instead constructed to support the runway).In the 2010s, SpaceX contracted with a Louisiana shipyard to build a floating landing platform for reusable orbital launch vehicles.