Six Tongan schoolboys were stranded on deserted island for 15 months in 1966
The teenagers worked in pairs to hunt, gather and keep watch while on island
Spanish explorer Alvaro Cerezo investigated and tracked down Kolo Fekitoa
Kolo, who had terminal bowel cancer, wanted to return to island before he died
In February 2015, the pair made the 24-hour journey back to island of Ata
This is the moment a 'real life Lord of the Flies' castaway returned to the island 50 years after he was shipwrecked there as a teenager for 15 months.