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Soon, the stability of the entire void space began to deteriorate rapidly. Ram and the others could feel it—their time was running out. Based on their calculations, it would take about a week, maybe ten days at most, before the entire void space collapsed in on itself.

This was the common situation, that occurs when the monster dens inside the void spaces are rashly destroyed to the point of being unable to regenerate again. 

However, most professionals who clear the void spaces won't rashly destroy the entire void space, like what happened on the third floor. 

Usually, void spaces themselves are considered very precious resources. Many large and small organizations control them to cultivate more resources through newly generated monsters for card drops or many other purposes. 

With the loss of stability in space, Ram and others also felt that they could already leave the void space.