The Infanteriebunker Wisli Süd A6231 Feld-Mg is a Swiss military bunker located near the village of Wisli in the canton of St. Gallen. Built during the Cold War era as part of Switzerland's comprehensive defensive strategy, this infantry bunker was designed to house machine-gun positions and provide protection for soldiers defending the strategic Alpine passes.
The structure exemplifies Switzerland's policy of armed neutrality and its extensive network of fortifications constructed to deter potential invasions during the heightened tensions of the mid-20th century.