From Wikipedia: King Hezekiah’s tunnel, leading from the Gihon Spring to the Pool of Siloam, was designed as an aqueduct to provide Jerusalem with water during an impending siege by the Assyrians.
The tunnel was excavated by two teams, one starting at each end of the tunnel and then meeting in the middle. . . . It is clear from the tunnel itself that several directional errors were made during its construction.
The difficult feat of making two teams digging from opposite ends meet far underground is now understood to have been accomplished by directing the two teams from above using sounds generated by hammering on the solid karst through which the tunnelers were digging.
Hezekiah–God is my strength
We praise Your holy name. We thank You that by the sacrifice of Jesus You have redeemed us from death. Jesus is the Lord of life!
You are our strength. Just as the men of Jerusalem used tools to chip through the rock to provide life-giving water to their city, we chip through the legal barriers with the sword of the Spirit to protect life in our state.
Direct the Mississippi intercessors, pro-life activists, legislators, government officials, and judges from above, dear Lord. Show them the way to making Mississippi abortion-free.
O carpenter of Nazareth! Hammer from above so that we, even in our mortal frames, will know what to do. Amen.