What is this in my provolone

I work in a specialty cheese shop. Today I was cutting up a loaf of imported provolone (arrived wrapped and in wax) and found this INSIDE the cheese. You can see the space it left in the cheese. It's rubbery. I've been to a few cheese-making places and can't figure what it is. *Please don't comment on my fingers. I work hard and its very cold and dry.