MIT develops a sensor that can work underwater without a battery and send back data

MIT researchers have created a new underwater sensor and communication system that doesn't require batteries, and barely uses any power at all. This could help set up an underwater Internet of Things, according to MIT, which would allow for real-time sea temperature and marine life monitoring, without requiring regular equipment and power swaps to make it work. Without that requirement, it would even be possible to set up networks of underwater sensors in the seas of distant planets.