U.S. Air Force Airman 1st Class Austin Zudak, 633rd Communication Squadron cable and antenna apprentice, climbs out of a manhole after performing a routine cable inspection at Joint Base Langley-Eustis, Va., Nov. 15, 2016. Before entering the manhole, the Airmen pumped out the manhole, which fills regularly with rain and ground water. (U.S. Air Force photo by Kaylee Dubois)

U.S. Air Force Staff Sgt. Michael LeMõn, 633rd Communication Squadron cable and antenna supervisor, and Airman 1st Class Austin Zudak, 633rd CS cable and antenna apprentice, unpack tubes to pump out a water-filled manhole at Joint Base Langley-Eustis, Va., Nov. 15, 2016. After pumping out the water, the technicians test the amount of gas in the manhole to ensure the safety of the Airmen entering the hole. Gas forms under the water due to its greater density. (U.S. Air Force photo by Kaylee Dubois)

U.S. Air Force Senior Airman Bruce Winsemius, 633rd Communication Squadron cable and antenna technician, ties a group of cables together during a preventive maintenance and inspection at Joint Base Langley-Eustis, Va., Nov. 15, 2016. The 633rd CS Airmen ensure cables across base are up to standards and that the conditions of the manholes are acceptable. (U.S. Air Force photo by Kaylee Dubois)

U.S. Air Force Senior Airman Bruce Winsemius, 633rd Communication Squadron cable and antenna technician, and Airman 1st Class Austin Zudak, 633rd Communication Squadron cable and antenna apprentice, mark the cable lines with spray paint at Langley Air Force Base, Va., Nov. 15, 2016. Using the electronic detection device, the cable and antenna team can map out the lines of cable throughout base. (U.S. Air Force photo by Kaylee Dubois)

U.S. Air Force Senior Airman Bruce Winsemius, 633rd Communication Squadron cable and antenna technician, opens a manhole at Joint Base Langley-Eustis, Va., Nov. 15, 2016. The 633rd CS cable and antenna Airmen inspect cables throughout base each month as part of their preventive maintenance inspection. (U.S. Air Force photo by Kaylee Dubois)