  This paper discusses the experiences gained from designing, deploying and
maintaining low-power wireless sensor networks in three geothermally active
remote locations in Iceland. The purpose of deploying the network was to
collect soil temperature data and investigate the impact of global warming on
(sub)Arctic climate and subsequent carbon release. Functional networks from
three sites with no direct access to power and the internet have been providing
researchers with insight into the warming impacts since 2021. The network
employs low-power wireless sensor nodes equipped with DASH7 communication
protocol, providing real-time data and remote access to sensors and instruments
deployed in the field. In addition to discussing the architecture and
deployment of the network, we conduct a primary analysis using models and
methods to demonstrate the feasibility of harvesting energy from the
temperature gradient between geothermally active soil and air.
