By the 3rd millennium BC refined rock asphalt was in use in the region, and was used to waterproof the Great Bath in Mohenjo-daro.
baɪ ðə θˈɜːd mɪlˈɛniəm bˌiːsˈiː ɹᵻfˈaɪnd ɹˈɑːk ˈæsfɔlt wʌz ɪn jˈuːs ɪnðə ɹˈiːdʒən, ænd wʌz jˈuːzd tə wˈɔːɾɚpɹˌuːf ðə ɡɹˈeɪt bˈæθ ɪn moʊhˈɛndʒoʊdˈæɹoʊ.