Kerala’s Kuttanad—a region covering Alappuzha, Kottayam and Pathanamthitta districts—is one of the few places in the world where farming takes place below sea level, with paddy fields 1.2 m to 3 m below sea level. In 2016, the Kerala government appointed drone manufacturer Throttle Aerospace Systems (TAS) to analyse 25 acres of paddy fields in Kuttanad, where water salinity is extremely high.