Georgia’s winemaking tradition has been making headlines since scientists announced, after 8,000-year-old jars bearing images of grape clusters and a man dancing were excavated in a dig south of Tbilisi, that the country is home to the world’s oldest wine.

But long before this discovery was made public, filmmaker Emily Railsback and award-winning sommelier Jeremy Quinn were traversing Georgia to research the rebirth of these ancient winemaking traditions, which were almost lost during the period of Soviet rule. Railsback chronicled their deep dive into the world of family vintners and grape sleuths in the documentary Our Blood Is Wine, an official selection of the 2018 Berlinale International Film Festival.