Switzerland is reviving its wartime bunker system due to security concerns from the Ukraine war. The Swiss military is reassessing around 8,000 bunkers, originally built for defense during WWII and the Cold War, many of which have been repurposed for civilian use. In 2023, sales of these bunkers were halted to explore modern repurposing options, aiming to enhance national defense and accommodate refugees. An innovation day is planned to gather ideas for their future use.