anchor: A later tunnel, built by King Hezekiah in 701 b.c. , from inside the city walls to to the hidden Gihon Spring in the valley outside the walls allowed Jerusalem to survive the onslaught of Assyrian armies that had already destroyed the northern Kingdom of Israel and swept its ten tribes from the annals of history.
positive: A tunnel helped Jerusalem survive invading Assyrian armies.
negative: Jerusalem was wiped out by the Assyrian armies.