A private labyrinth of program with a public agenda engages the shifting gravel coastline of Longyearbyen. The threshold bridges the two banks of the Longyearbyen River Estuary seasonally and connects two sections of the city which currently exist in isolation from one another. The formation of sea ice and gravel deposits allow accessibility to certain programs of the bridge. By isolating certain program from the central pedestrian path, accessibility is only available in certain conditions. The varying conditions of narrow spaces allow for programs to create microclimates outside the walls which enclose them. This allows for a functional year-round building which is as seasonally dynamic as the arctic itself