RMIT (Research) is leading a project for a self-organising, low-cost, high-altitude balloon constellation (pseudo-satellite) for persistent surveillance and communications. The lead is supported by a range of partners including LUXAerobot, the ADF – Defence AI Centre, SmartSat CRC and others joining soon. This project aims to deliver an initial prototype stratospheric self-organising balloon constellation for persistent ISR and communications, specifically to test key control algorithms and sensing capabilities for a full-scale project. It is a proof of concept for low-cost constellation to support persistent ISR and comms in military operations over land and sea; replace high-cost, low persistence space-based solutions; deployable from anywhere. The initial concept will consider bushfire monitoring as an application.