Siloam inscription, Limestone, Jerusalem, Siloam Tunnel, beginning of 7th century BC. A tunnel was, according to the Bible cut by Hezekiah to prevent a water shortage in case of a siege by the Assyrians. The text on the inscription describes the moment people working towards each other from two sides heard each other, thus knowing where to connect the two parts.
Howaver: in the Wikipedia I read “Excavation work in the tunnel by Ronny Reich of the University of Haifa and Eli Shukron of the Israel Antiquities Authority has cast doubt over the attribution of the tunnel to the reign of Hezekiah. They believe the evidence points to a date several decades earlier, in the last part of the 9th century or early part of the 8th century BC. They note that the biblical passage connecting Hezekiah to the construction of waterworks doesn't specify a place in the city, and suggest it might refer to waterworks in the Mamilla area”. I understand the link to Hezekiah is not made in the inscription, so the description of the connecting of the parts would still hold.