[IAA archaeologist Yaakov] Billig said that the new excavations are not being conducting merely for the sake of nostalgia, however. Rather, researchers are still amazed and even somewhat mystified by the precision technology constructed in antiquity without the aid of GPS or modern computation methods.The story is also covered by Judith Sudilovsky in the Jerusalem Post: New segment of Hasmonean aqueduct to Jerusalem exposed in capital neighborhood. An engineering feat of ingenuity allowed the aqueduct that served as Jerusalem's main water supply to be in use for 2000 years. A new section of it was found in Armon Hanatsiv.
For more on the Lower Aqueduct to Jerusalem, see here and here.
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