The use of natural bitumen for waterproofing, and as an adhesive dates at least to the fifth millennium BC, with a crop storage basket discovered in Mehrgarh, of the Indus Valley civilization, lined with it.
ðə jˈuːs ʌv nˈætʃɚɹəl bɪtˈuːmɛn fɔːɹ wˈɔːɾɚpɹˌuːfɪŋ, ænd æz ɐn ɐdhˈiːsɪv dˈeɪts æt lˈiːst tə ðə fˈɪfθ mɪlˈɛniəm bˌiːsˈiː, wɪð ɐ kɹˈɑːp stˈoːɹɪdʒ bˈæskɪt dɪskˈʌvɚd ɪn mˈeɪəɡˌɑːɹ, ʌvðɪ ɪndˈʌs vˈæli sˌɪvɪlᵻzˈeɪʃən, lˈaɪnd wɪð ɪt.