PermaSense
PermaSense observes physical parameters related to permafrost in steep high-alpine terrain over multiple years. Live sensor network data is transmitted from the Matterhorn, Switzerland field site at 3400 m.
Currently, they have 15 nodes sampling at 2 min intervals and relaying the data back home in real time. Estimated lifetime is 3 years with a little over 34 months to go! Check out the project website here. Presentation slides are here.

