Article continues below advertisementCops are continuously investigating the vanishing of Savannah Guthrie's mom, Nancy. In a new update, authorities were seen exploring the septic tank behind her house in Tucson, Ariz., on Sunday, February 8.According to drone footage, three officers were spotted putting a long pole down a manhole behind the home.Article continues below advertisementCops Looked Around Nancy Guthrie's Home for CluesSource: @s_rumpfwhitten/XCops are searching the septic tank behind Nancy Guthrie's Arizona home as they continue to investigate her disappearance.