From the 1930s to the 1940s, Mumbai was a city of modern architecture marked by international influences, but also the birthplace of a modern Indian architectural style that became fully expressed after 1947. This heritage has rarely been considered by international research, despite its recent inclusion on the UNESCO World Heritage List (2018) and the very active involvement of local groups. A report published in the journal Nature in 2019 highlighted the consequences of climate change and rising water levels on the city of Mumbai, built on an artificial peninsula. Hence the urgent need to complete the task of researching, locating and digitizing sources on the modern architecture of Mumbai, a heritage doubly threatened by the effects of global warming and excessive urban development.