Since I don't know what 'gehra paani' specifically refers to in terms of a story, it could be a story about deep water (as 'gehra' can mean deep and 'paani' means water in Hindi). Maybe it's a fable about a creature that lives in deep water, or an adventure that takes place in a deep water body. But again, this is just speculation without more information.
I really don't have much to say about the 'gehra paani' story as I have no prior knowledge of it. It could be a unique story from a particular region or community.
Yes, 'Kaala Paani' is based on a real - life situation. It delves into the harrowing tales of the Cellular Jail in the Andaman and Nicobar Islands, which was used by the British to imprison Indian freedom fighters. The show portrays the inhumane conditions, the struggles, and the unwavering spirit of the inmates.
Well, it's not straightforward to say. The story of Kaala Paani might incorporate elements of reality, but it's also likely embellished or fictionalized for dramatic effect.