The Lunar Nano Drone (LuNaDrone) mission concept was conceived in light of the Artemis Accords signed by Italy and USA in 2020 and is associated with Italy's call to contribute to the development of enabling technologies for lunar surface exploration. The long term vision involves permanent or semi-permanent outposts on the moon, which require new approaches and solutions involving the study of lunar caverns and lava tubes. The goal of this mission is to explore possible entrances to lava tubes via an autonomous spacecraft, for which the Politecnico di Torino has been leading the feasibility and preliminary design studies since early 2020.