The Dead Sea Scrolls were first discovered in 1946. These documents have increased our knowledge of biblical literature. There is a debate over who hid these scrolls. According to Wikipedia, "The scrolls are traditionally identified with the ancient Jewish sect called the Essenes, though some recent interpretations have challenged this association and argue that the scrolls were penned by priests in Jerusalem, Zadokites, or other unknown Jewish groups."
According to Wikipedia,"ninety percent of the Dead Sea Scrolls and scroll fragments" were discovered in this cave.
Websites with additional information about the Dead Sea Scrolls: