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However , one expert , retired Captain Igor Kudrin , warned in response to a question on NTV that since " the submarine is lying on the seabed at an angle of 60 degrees , this operation will be extremely difficult . "
 one expert, retired Captain, retired Captain Igor Kudrin, the submarine, the seabed
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:
 one expert, retired Captain, retired Captain Igor Kudrin, the submarine, the seabed