The Secret of Skinwalker Ranch S03E05 - Digging Up the Past

The Secret of Skinwalker Ranch (2020)
S03E05 Digging Up the Past
Episode Overview
Retired Army Colonel John Alexander, a former NIDS employee, pays a visit to the ranch. After the Skinwalker team conducts an experiment he suggests might have created a portal, they pick up an enigmatic signal that seems to be a communication attempt.