ABC originally hired Jeffrey Lieber to write a test script but it was not well received. He changed the name to Nowhere and ABC hated it so they hired J.J Abrams instead. However, Abrams was busy with Alias and so passed it off to Damien Lindelof to write a draft. It was Lindelof who came up with the idea that the characters would find a hatch in the middle of the jungle and spend the whole first season trying to open it. Good job, Damien.
The Original Writers