Interdisciplinary collaborations are easier said than done! The complexity of societal challenges requires approaches that cross disciplinary and institutional boundaries. This documentary, presented by the Centre for Unusual Collaborations (CUCo), highlights the challenges of interdisciplinary collaboration in the Structures of Strength project team. In this documentary a group of mid-career academics ranging from geologists, to art historians, to medical scientists and beyond, takes you along their interdisciplinary journey. 1+1=3 shows their great enthusiasm, as well as the barriers they encounter. It also shows how some of those are overcome.