Which technique did the two protesters of the Sardar Sarovar Dam project (Medha Patkar and Narendra Modi) use to gain attention for their protests?

The technique which two protesters of the Sardar Sarovar Dam project use to gain attention tot heir protests is: a hunger strike/fasting

They began their fast to protest the central government that stands with the Sarovar dam project that endangers civilian's farm lands by increasing the height of the dam.