Life rafts and escape chutes on a sister ship to the sunken Sewol ferry have been found to not work properly, the Reuters news agency has reported investigators as saying.
More than 300 people, most of them students and teachers from the Danwon High School near Seoul, are dead or missing presumed dead after the April 16 disaster.
The confirmed death toll currently stands at 181.
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A major search at Camber Sands in East Sussex was called off as swimmer thought to be missing was identified and found to be safe and well.
John Newman said "there are people in far worse situations than me and I want to give them a bit of hope".