On the island, he discovered a massive white orb, and realized it was the egg of giant, mythical, dangerous bird called the roc. Determined to get off the island, he hid amongst the nest until the roc landed, and then strapped himself to the bird's leg. When it took flight again, it carried Sinbad to a valley far away. Unfortunately, this valley was not only impossible to climb out of, but it was also full of the roc's natural prey: huge snakes that could swallow an elephant. Worst of all, Sinbad was running out of provisions. The valley floor was also covered with beautiful diamonds, though their value offered Sinbad nothing in his predicament.