Help/info needed-Mini fridge hear air coming out

I cut a hole in my mini fridge. Need to run soda lines in to a cold plate I have in the fridge. Didn’t see anywhere where I cut a line or anything. I hear "air coming from the hole I cut. I don’t know a lot about refrigerators but I figured if I miss the coolant lines I’ll be OK. Thanks for any help. It’s a Haier 2.7cf

Air stopped shortly after I drilled the hole.Then it starts coming out when I plug it back up again.Then stopped about 30 seconds later. could it be the fan just blowing between the foam insulation and the metal casing?