What are 'Modi Bunkers' and how they may prove crucial in case of an India-Pakistan war

Amid rising India-Pakistan tensions, 'Modi Bunkers' along the LoC and IB in Jammu and Kashmir are being revitalized to protect civilians from potential cross-border attacks. Following the Pahalgam terror attack, villagers are cleaning and restocking these shelters, while the Indian government has ordered nationwide mock drills to enhance preparedness for potential escalations and hostile attacks.