A bomb shelter is a safe place where people can go during a bombing or a threat of a bomb or other dangerous attack. It is designed to protect people from harm and keep them safe. Full definition
An underground bomb shelter holds survivors in the wake of a nuclear winter, but their one - world civilization isn't big enough for the five of them. (tubitv.com)
The second interpretation is more alarmist and basically tells you to start digging that backyard bomb shelter. (informationclearinghouse.info)
Is the call to action on global warming nothing more than the 1950's bomb shelter mentality? (climate-skeptic.com)