SCP-1671-A is a hemisphere of cast iron, measuring 4.5 meters in diameter and 2.25 meters in height, located in the entry chamber of SCP-1671. Four 1.5 by 1.5 m hatches are located at 90 degree intervals on SCP-1671-A. The lower levels of SCP-1671 contain seams of human corpses, designated SCP-1671-1