This 17 June 2020 video says about itself:
Ecuador: ‘Diego’ the turtle, who sired 800 babies and saved his species, returns home after 87 years
Mandatory Credit: Ministry of Environment and Water of Ecuador
‘Diego’, the world’s most famous giant tortoise, returned to Espanola Island in the Galapagos archipelago on Monday after helping breed some 800 turtle hatchlings in captivity, saving his species from extinction.
Diego and 15 other turtles that were part of the project were subjected to a quarantine process and internal deworming. They were then fitted with an identification microchip before leaving Santa Cruz Island on board a boat bound for Espanola Island.
Diego had remained in captivity for decades, helping to multiply the endemic population of giant tortoises from 15 to 2,300, and in so doing becoming recognised as the saviour of his species.
The repopulation project began in the 1960s after experts determined that the population had been reduced to just two males and 12 females.