The place Yun Yao spoke about was one of the nation's war supplies warehouses.
When war erupted, these supplies would be used. However, World War Three had happened too suddenly with nuclear bombings raining down on various parts of the world. Before many supply warehouses could be opened, they became 'non-existent' places where no one knew of them due to the death of those who knew the information.
"Are you certain?"
Sun Mo sat beside Yun Yao. "What is your clue? Can you show it to me?"
"I've been searching for five years, what do you think?"
Yun Yao rolled her eyes. After that, she used her fingers to rap her temples. "Clues? It's here, in my head!"
Sun Mo swept his glance over the map. "You don't know how to use the carpet-style search method, right?"
"Ah?"
Yun Yao started. (Do I look like a fool that would use such a clumsy method? But how did you manage to guess it correctly in the first instance?)