The Smart Infrastructure (Smart Infra) Platform is a project NTT Infrastructure Network Corporation is advancing for improving the efficiency of infrastructure-facility work through digital transformation.We are developing digital twins that will provide high-accuracy position information (absolute position) of infrastructure facilities buried underground.By sharing digital information among infrastructure providers, we seek to implement a model in which tasks being done by workers to date are digitized and manpower is shared by unifying similar tasks.We are also aiming to add digital twins of aboveground facilities and expand the Smart Infra Platform to other fields such as disaster prevention/mitigation and smart cities.