Three teenagers from Indore, India, created a revolutionary mini refrigerator called Thermavault that uses salt to self-cool, enabling it to operate without electricity. Concerned about the challenges in delivering COVID-19 vaccines to rural areas, Dhruv Chaudhary, Mithran Ladhania, and Mridul Jain leveraged their medical backgrounds to design the innovative solution. Their creation won the 2025 Earth Prize, which includes $12,500 to manufacture 200 units for testing in 120 hospitals. The fridge can keep vaccines cold for up to 12 hours, potentially transforming healthcare logistics in remote regions.
With some improvements like a built-in temperature monitor, he added, "it will be definitely helpful, definitely useful in the remote places, the villages."
Their invention, which they call Thermavault, won them the 2025 Earth Prize on Saturday. The award comes with $12,500, which they plan to use to build 200 of their refrigerators and send them to 120 hospitals for testing.
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