@Hollow7F a squad dispatched into scp 1983-1, they did not return.
A second squad dispatched into scp 1983-1 to determine the fate of the first squad, they did not return.
They finally sent a class D personel called D-14134 into scp 1983 to explore as much as he can and then return.
After 30 mins the anomaly inside the house disappeared. Inside they found several corpses of foundation agent and a note indicated that D-14134 neutralized scp 1983 by himself.
Full note can be found here
http://www.scp-wiki.net/scp-1983