Give me an explanation ——

" I think we should take advantage of their lack of attacks and leave," Tan Si spoke up finally. She also did not want to be ungrateful especially not after getting scolded left and right by the members of the Mo Qiang team but Tan Si also felt that there was no point in staying in front of the cave while trying to pave their way inside the cave. 

She then continued to speak, " Even if you don't worry about yourselves, you should at least worry about your team members. How long can they stay here? The oxygen in their tanks is going to run out sooner or later." 

Even though they had changed their oxygen cylinders, the oxygen inside the cylinders was slowly running out. After all, they had been in this dimension for more than three hours and couldn't stay behind anymore.