"This is the most massive wall that has ever been uncovered in the City of David," Reich and Shukron said in a joint statement about the find. It marks the first time "that such massive construction that predates the Herodian period has been discovered in Jerusalem."

It appears to be part of a "protected, well-fortified passage that descends to the spring tower from some sort of fortress that stood at the top of the hill," according to the joint statement.

The spring "is located in the weakest and most vulnerable place in the area. The construction of a protected passage, even though it involves tremendous effort, is a solution for which there are several parallels in antiquity, albeit from periods that are later than the remains described here."

It makes you wonder what else there is to uncover,its fascinating