To build a bunker, select a suitable location, preferably on higher ground with good drainage. Obtain necessary permits and create a design that includes an entrance, ventilation, and utilities. Excavate the site, pour a reinforced concrete foundation, and erect the bunker's walls using reinforced concrete, cinder blocks, or steel. Install a sturdy, blast-resistant door and a ventilation system with air filtration. Insulate, waterproof, and backfill around the bunker. Complete the interior with electrical, plumbing, and communication systems. Finally, stock it with essential supplies like food, water, and medical items.
