C133 The Line of Defense Was Broken

The three students who were piloting the Cob Cannon were ready to seize the opportunity to launch another shot. However, just as they clicked the launch button, a notification sound rang out from the Cob Cannon. It turned out that every time the Cob Cannon was launched, it would have a cooldown period of half an hour.

Not to mention everyone, even Qin Hao, the owner, did not know about this