What Happened to the Sunken City of Cuba?

[guohua]

Over a 18 years ago, a team of explorers were working on an exploration and survey mission off the western coast of Cuba when their sonar equipment picked up a series of stone structures deep below the surface. The structures appeared completely Weird against the barren ocean floor and seemed to show organized stones like buildings of an urban city I thought. 
So, What Happened?
Why wasn't there a more thorough investigation?

Why did they not want to allow this discovery to be fully investigated?
Could it had been because this sunken city did not Fit Into Their Timeline Of When Humans Were Building Huge Cities?

They say these structures are to deep to ever have been above water!! 
Are us a video explaining just that.