Combine caramels (unwrapped) and heavy cream in a medium, microwave safe mixing bowl and heat in 30 second intervals, stirring in between until completely melted and smooth.
Repeat as above with the chocolate chips, sweetened condensed milk and salt in a medium bowl
Stir in pecans and vanilla into the chocolate mixture
Pour half of the fudge mixture into the prepared pan.
Pour the caramel over the fudge layer.
Pour remaining half of fudge over the caramel, swirl gently with a knife.