The November 2013 Tremors was a series of minor tremors that escalated, and led to the Cave Mine being closed. Only the Underground areas were damaged, unlike the earlier Earthquake in 2008.
It had been reported earlier in the Club Penguin Times that there were minor tremors occurring underground, caused from zombies cracking the ground on the Halloween Party 2013, until one was large enough that the entire cave mine was caved in. This resulted in the Cave Mine being closed indefinitely, blocked from both the Mine and the Hidden Lake.
As a result of the tremors, the Cave Mine was closed indefinitely. Workers also discovered remnants of Garianna's studies in Gold Mine.