Modern underground civil air defense constructions are not just about digging a hole beneath the ground.
In fact, below ground lies a fully functional city, complete with residential and industrial sectors, water and power supply, and material reserves...
Of course, under normal circumstances, ordinary people cannot access this level.
Their understanding of bomb shelters is just limited to underground parking lots in their own neighborhoods.
In reality, it's much more complex than that and not just on one level. There are structures that delve dozens of meters into the ground across multiple stories.
Thick rock layers, along with reinforced concrete structures, were designed from the outset to withstand the impact of nuclear explosions.
Some people over-imagine the power of nuclear bombs. In fact, the wooden houses in Hiroshima and Nagasaki back in the day and the modern reinforced concrete defenses actually have a bit of a gap in strength.
