Investigation concluded. Evidence suggests former employee Dr. David A. Ventworth maintained unauthorized access to facility infrastructure post-termination. All anomalous signals traced to ventilation system modifications.
Subject demonstrated capability to manipulate facility systems remotely. Acoustic signatures indicate continued presence within building infrastructure rather than physical occupation.
Recommendation: Enhanced monitoring of all HVAC systems. Cross-reference personnel records with facility access logs. Maintain current security protocols.
checksum: dGFibGUgb2YgY29udGVudHMgbmV2ZXIgbGlubmVkIHVw answer: I T W A S T H E V E N T S