Protect the underground

Society for the protection
of underground networks



Map the fungal networks of planet earth


Advocate for the protection of underground ecosystems


Drive innovation in underground climate science

Underground climate movement

Fungal networks support much of life on earth. SPUN is a science-based initiative founded to map fungal networks and advocate for their protection.

In collaboration with researchers and local communities, we aim to accelerate efforts to protect underground ecosystems largely absent from conservation and climate agendas.

S. Spačal

Underground networks

Over their 475 million year evolution, mycorrhizal networks have evolved abilities that have shaped the living world. Underground ecosystems are astonishingly diverse and remain largely unexplored.

L. Oyarte Galvez, AMOLF

Climate action

Fungal networks are one of the biggest untapped levers in climate science. Billions of tons of carbon dioxide flow annually from plants to fungal networks. This carbon flow helps make soils the second largest global carbon sink, after oceans.

Climate action →


Fungal networks underpin life on Earth. As networks disappear at an alarming rate, we destabilize ecosystems and lose the opportunity to partner with fungi to revolutionize agriculture, forestry, and carbon capture.

Threats to networks →

Underground Explorers

Our underground explorer program will work with local teams of underground explorers, or ‘myconauts’, to map the fungal networks of planet Earth. Together with the Crowther Lab at ETH, Zurich, we are mapping the biodiversity hotspots of network-forming fungi.

Photo of SPUN co-founder Toby Kiers


SPUN is a non-profit science initiative founded to map fungal networks, advocate for their protection and accelerate the underground climate movement. We are an international network of scientists, activists and local communities dedicated to protecting the underground ecosystems that sustain all life on Earth.

About SPUN →

Take action

Help protect and restore the fungal networks that regulate the Earth’s climate and ecosystems.