 When Crabb had recovered sufficiently, the Soviets began to interrogate him; Crabb was making a confession when he collapsed and this time did not recover.The Soviets, aware that they might be accused of causing his death, decided to fix his body lightly to the bottom of the ship so that it came loose once the ship was under way.In the event, the body entangled in something underwater which meant it did not get discovered for fourteen months.