The copy, which you can't see because it goes on and on for several pages, says that steerage passengers can't get their to bunks before the voyage is over, and it's so safe it carries no insurance.
数ページにわたって 続いているので見られませんが 「三等船室の乗客は航海が 終わるまで 船室にたどり着けず 保険が必要ないほど 安全である」と書いてあります