Survivors of a boat carrying at least two Britons which sank while travelling between islands in Indonesia swam for six hours to reach safety.
French victim Bertrand Homassel told the Daily Mail some members of the group took the life-threatening decision to swim to a nearby island.
Once there they were forced to drink their own urine and eat leaves to survive.
Mr Homassel said: "Six people were in the lifeboat. The others climbed onto the roof of the boat, which had not completely sunk.
"We waited until midday on Saturday. We were five kilometres (three miles) from the coast - there were many big waves separating us from the coast.
"People started to panic... Everyone took the decision to swim to the closest island, five kilometres away, where there was an erupting volcano."
The group were saved after attracting the attention of a passing boat on Sunday. "I was really very lucky," Mr Homassel added.
More top news
Delivery firms hold out against calls to improve conditions for self-employed workers as Hermes says any such move could cause job losses.
Wet and very windy weather spread in from the west overnight with snow expected across much of southern Scotland.
Family of suicide bomber Jamal al Harith said he would never have turned to terror before he was held for two years in notorious US camp.