Why do we need a fourth expedition to Lachish?

Lachish, located in the Judean foothills, was the second largest city in the Biblical kingdom of Judah, after Jerusalem. It has already been excavated by three different expeditions, but could there still be answers in the ground waiting? In this lecture, Yosef Garfinkel discusses the finds at Lachish and why there should be a fourth expedition to Lachish.

This was part of the Unearthing Israel DVD.