Two subsea communications cables were recently installed off Jacksonville and Miami. Attached is a link to a pdf file that shows the locations. If fishing gear snags a cable, both the gear and the cable can be damaged, and these cables may not be on charts yet. They carry internet, telephone, fax and data to South America and other countries.
https://shrimpalliance.com/wp-content/uploads/2014/02/Cable_AMX-1_Jacksonville-Miami_20140120.pdf