Large corporations are shopping for underground bunkers that can survive a nuclear blast to protect their data centers and C-suite employees as geopolitical tensions rise. The first adopters are primarily cryptocurrency firms, companies that build the facilities told Semafor.Larry Hall, owner of Kansas-based Survival Condo, said he recently priced an underground data center and executive suite space to a crypto company for $64 million. Survival Condo counts eight companies in the planning stages...