“It’s all about the End of Days, the Second Coming, Armageddon, the Rapture,” Debbie (Lauren Ambrose) says in what is the clearest explanation by any character of what is going on in “Dig” to date. “In order to bring about the Second Coming, the Temple in Jerusalem needs to be rebuilt.”No excavation or building on the Temple Mount, please. Fortunately, this is the agenda of "the apparent bad guys" in the series, so they probably won't succeed.
Background here and links.