Elon Musk praises Romania’s Slănic Prahova Salt Mine on X American tech billionaire Elon Musk shared a viral video presenting the spectacular underground galleries in Romania’s Slănic Prahova Salt Mine on X, the social media platform he owns. The original post, made by the page Tolkien Universe, compared the Slănic Salt Mine to the fantasy universe from The Lord of the Rings. The comparison quickly attracted online attention, and Musk commented, “Wow!” Wow — Elon Musk (@elonmusk) May 3, 2026 The Unirea Mine, located approximately 100 kilometers from Bucharest, features enormous galleries, with walls tens of meters high and chambers resembling a cathedral carved into salt.