This hatchway was cut through the forward starboard bulkhead of NIC, providing access to this equipment and operations space (see Roger Gilfert's Bowditch NIC photos).  This used part of the compartment once occupied by the electronics storeroom.  During one of the yard periods in the early 70's, the Survey Control Center (SCC), originally located in a space on the 03 Level on the starboard side just aft of the bridge, was moved here.  Precision depth recorders and other equipment apparently were added to the OcUNIT TOE.