Due to compact size and relative ease of installation, mobile satellite equipment very well suits requirements of telemetry applications. Iridium satellite system capabilities have been used by scientists to receive data about ice sickness in the Arctic Ocean. A buoy with sensors installed in the remote area can acquire and transmit up to five hours of data for each measurement of deep-water waves under the ice. Since Iridium allows two-way data transfer, the buoy could not only transmit the data, but also received setup commands from the control center.
BYM News reported that the system lasted one year before being crashed by ice and trasmitted 6MB of data during that time. This equals to a speed rate about 1.5 bit per second 🙂
I assume some sort of solar power was used to provide juice to both sensors and the Iridium transceiver.