The Yuc Express was to be the "winter route" for the Scotia Prince which runs between NS and ME in the summer. They tried it one season between Tampa and Progreso (Merida)& shelved it citing lack of business and "porting issues". Interestingly enough, the website is still up, even though its not been updated in quite some time.
They also offered a now dormant Tampa/Cuba run....novel idea, but who the hell was their market?