How did the giant tortoises get to the Galápagos Islands?

https://mariosxmi416.edublogs.org/2021/05/01/how-did-land-turtles-get-to-the-galapagos-islands/

The giant land turtles are legendary animals, normally enjoying a lifespan for more than one hundred years and having a weight of as significantly as 400kg. They are only to be found around the Galápagos Islands