Bake the cake as
directed on the box. Cool completely. Once
cool, using the straw,
put holes all over the entire cake, make sure
to go all the way to
the bottom of the pan. Pour the can of
condensed milk over
the cake filling the holes. Repeat with jar of
caramel topping.
Spread whipped topping over top of cake.
Sprinkle Heath Bars on
top of whipped topping. Chill in refrigerator.