New details have been announced about the search to find the sunken cargo ship "El Faro."

The National Transportation Safety Board says the Navy will use sonar technology and remotely-operated vehicles to try and locate the 790-foot ship, which disappeared during hurricane Joaquin. 

The ship, holding 33 people including 28 Americans, lost contact near the Bahamas last week. 

Meanwhile, El Faro’s sister ship returned to Florida Thursday afternoon.

The NTSB had been waiting for it to return because investigators say it is comparable in size and structure. They hope it can help them determine what caused El Faro to have mechanical issues.

The ship’s owner says the captain’s of both ships traded notes about the incoming weather as they passed each other last week. 

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