Come on the OP needs to help out a bit more, empty out the cupboard under the sink, lie on your back if necessary and get your head under the back of the sink with a torch and see what, if anything is supporting the back of the worktop, confirm there's nothing connected to the waste, take a photo from further away, take some photos looking under the sink at the underside of the worktop ....
Old saying where I work, 'crap in crap out' if you only offer crap information you'll only get crap results.