One or two merchant ships seemed to be slowing down, and the two small rescue ships, the Rathlin and the Zamelac were manoeuvering around. One merchant ship that I had in sight just vanished as I was looking at her; one second she was there and the next all there was left was a huge pall of smoke, reaching up towards the blue sky. I had not the time to see if she was a tanker or not. The crew would not have known what hit them. It was an unbelievable thing to see happen, and quite unforgettable.