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At the age of 11 in 1985, Salva Dut was separated from his family by the Sudanese civil war. After a decade moving between different refugee camps, and presumed an orphan, Salva was recommended for resettlement in the United States as part of a UN-backed programme to support some 4,000 so-called 'lost boys' who'd been displaced by conflict. Salva settled with a host family in Rochester, New York. But when he was in his late 20s, he found out that his father was in fact still alive. Salva travelled back to Sudan to find him. His father was in a clinic and sick with a waterborne disease. Salva decided to try to bring clean water to his home village. A few years later, he established an NGO, Water for South Sudan, and he returned to his birthplace to drill his first well.

French explorer Alain Gachet quit a lucrative career in oil to search for water underground. Colleagues told him he was a 'crazy donkey', but he eventually developed an algorithm that allowed him to 'peel the earth like an onion' and detect water reserves underground. Soon, he was asked to help find water for desperate refugees escaping the conflict in Darfur. Alain spoke to Jo Fidgen in December 2023.

Presenter: Mobeen Azhar

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(Photo: Salva Dut drilling for water; Credit: Water for South Sudan, Inc)