5974
Sources at the Admiralty said telephone contact with the crew had stopped on Sunday but that " audio contact " and communication were possible using Morse code .
 the Admiralty, the crew
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 the Admiralty, the crew