New smart sensing and actuating applications in space and other extreme environments (SEE) are fuelling the need for innovative wireless sensing systems. These challenging environments are typically characterised by highly dynamic and unpredictable operating conditions, calling for new solutions based upon autonomous operation and embedded intelligence. There is a huge opportunity to apply our knowledge and capabilities to these demanding applications, and with the appropriate vision, superior solutions will emerge to support the use of wireless sensing systems in unconventional environments (UE) including space, underwater, underground, and other hostile and inaccessible environments. This workshop is a unique opportunity for specialised researchers and developers to share knowledge and exchange ideas on multi-faceted technologies required for the deployment of wireless sensing systems in unconventional environments