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.