In 2 Chronicles 32:4 it refers to the fact that Hezekiah's tunnel was built because King Hezekiah knew of the impeding attack of the Assyrians and decided to redirect the waters so that the Assyrians would not find the water supply.
"The Shiloah (Siloam) inscription (כתובת השילוח) or Silwan inscription is a passage of inscribed text found in theHezekiah tunnel "." It is among the oldest extant records of its kind written in Hebrew using the Paleo-Hebrew alphabet, and its association with the tunnel provides evidence for the ancient Biblical narrative.
The Siloam Inscription was one that described how the workers worked from one end of the tunnel towards the other and met up in the middle to carve through the tunnel.
In 2007, Jerusalem's Mayor, Uri Lupolianski, met with Turkey's ambassador to Israel, Namik Tan, and requested that the tablet be returned to Jerusalem as a "goodwill gesture." Turkey rejected the request, stating that the Siloam inscription was Imperial Ottoman property, and thus the cultural property of the Turkish Republic