Surprise Oreo Tunnel Cake
["1 (16 oz.) pkg. angel food cake mix", "2 (4-serving) pkg. instant pudding, any flavor (chocolate is best)", "2 c. milk", "2 c. heavy cream, divided", "21 Oreo sandwich cookies, divided", "2 Tbsp. hot fudge sauce", "colored sprinkles for garnish"]
["Prepare angel food cake according to package directions.", "Cool completely.", "Place cake on serving plate.", "Slice 1-inch layer from top and set aside."]
["angel food cake mix", "instant pudding", "milk", "heavy cream", "sandwich cookies", "sauce", "colored sprinkles"]