In developing the ideas that we see alive today, Hahn, along with Marina Ewald, a geography teacher at Salem School in Germany, facilitated an expedition to Finland. It was the summer of 1925, and the plan was to allow 20 students to undertake an Adventurous Journey.
The experience involved travelling across Germany, boarding the steamer ship to Helsinki, buying four used sailing boats, learning how to use them, trucking them up to Lake Saimaa, sailing day and night navigating towards Lake Lappenranta and Lake Kuopio. They progressed on their journey by hauling the boats overland to continue sailing south on Lake Paijanne. Finally, they returned to Helsinki to seek a buyer for their used vessels. It took the team, which was mostly made up of Grade 10 & 11 students, four weeks to achieve. Most of their food came from their ability to hunt and fish in the environments they found themselves travelling through.