Lizardo94

I have a question and I'm not sure what subject it would be under? I placed several red potatoes in a bag and vacuum sealed it. 2 weeks later, the bag had puffed up and looked about to explode. Inside, there was quite a bit of liquid and it looked like some of the potatoes had exploded. My questions are: What happened? What was the science going on here? How did liquid get inside a vacuum sealed bag? Was it the potatoes? Why did the liquid come out? HOW did the liquid come out? Why did the potatoes explode??