The captain was able to piece together all the information that had come to light, making certain that the Karen had been sailing in a convoy to Russia when she was torpedoed by an enemy submarine.
船长把发现的所有材料搜集在一起来进行分析，最后确信卡伦号是在赴俄国执行护航任务的途中被敌人潜艇发射的鱼雷击中的。
