This project has now reached the stage where a single balloon can stay aloft for more than six months and when linked with an upstream telecommunications network can provide cellular service for an area of around 3,000 square kilometres. These principal steps and key enablers all depend on critical ICT infrastructure which need to be protected to underpin their functioning. This involves assessing risks in qualitative and quantitative terms, where possible modelling them with available data, while considering issues of financing and insurance.