A bomb shelter is a structure designed to provide protection against the effects of a bomb. There are different types of bomb shelters, each configured to protect against different kinds of attacks and strengths of hostile explosives. Some common types of bomb shelters include:

• Air raid shelter: This is a structure built to protect against bomber planes dropping bombs over a large area. They were commonly seen during World War II, such as the "Anderson shelters" of the United Kingdom.

• Fallout shelter: This is a shelter designed specifically for a nuclear war, with thick walls made from materials intended to block the radiation from fallout resulting from a nuclear explosion. Many such shelters were constructed as civil defense measures during the Cold War.

• Blast shelter: This type of shelter protects against more conventional bomb blasts. Its main purpose is to protect from shock waves and overpressure and also from earthquakes.

Bomb shelters can be made of different materials, including earth, concrete, and solid-plate steel. They are commonly buried underground and are designed to create a temporarily livable environment when it is too dangerous to go outside. A good bomb shelter should be at a safe distance from fallout particles, have proper ventilation, and be waterproof in case of rain.

Overall, bomb shelters are designed to provide protection to individuals and families in the event of a disaster, whether it be a war, nuclear disaster, or economic collapse.