The U.S. Coast Guard has found the missing cargo ship, which was carrying more than 400 tons of medical supplies and supplies of food to Puerto Rico.

The Coast Guard said Thursday the Coast Guard Cutter Beale was searching in waters off Puerto Rico’s west coast for the cargo vessel, which is believed to have sunk in stormwater after the hurricane hit the island.

The cargo ship was about 50 feet (15 meters) long and 35 feet (10 meters) wide.

It was carrying about 400 tons (450 metric tons) of medical, pharmaceutical and other supplies to Puerto Rican medical facilities, including medical supplies for patients who were in intensive care units.

The ship’s captain is expected to be questioned by authorities as well as the crew and passengers on board, the Coast Guards said in a statement.

The U.K.-based Coast Guard, the U.N. ship Red Cross and the National Oceanic and Atmospheric Administration all responded to the discovery of the vessel.

The Associated Press contributed to this report.