62 percent of the crew was accounted for by 12 or 13-year-old boys who worked for a lighter in the basin of the Oka River and the Kama River: tributaries of the Volga River, and former servicemen.
なかでもヴォルガ川支流のオカ川、カマ川流域の艀で働く12～13歳の少年や退役軍人が全体の62％を占めていた。