Access Granted.
Warning: If you are viewing this Addendum and you do not have proper clearance, you are in violation of SCP-XXXX containment protocols.
SCP-XXXX does not release any form of radiation apart from the visible spectrum when its display is activated and the infrared from its constant core temperature (the significance of which is still unknown). This false hazard was fabricated to discourage researchers from requesting access as it poses a significant danger to mental stability. It should officially be given lowest research priority, and inquiries should be ignored.
The nature of the numbers displayed SCP-XXXX was suspected before it was acquired and has been experimentally confirmed. Foundation webcrawlers found an advertisement on a public online auction for a watch that counts down the time until the wearer's death. The site's code had several anomalous features that automatically flagged it for further scrutiny (see IT Log 34-B15-3). The Foundation attempted to locate the seller (who has the username "Nargaz24"), but all identifying information, including routing and ISP numbers, were untraceable.
Agents acquired the item via bidding (see Purchase Order #39567), and it was promptly delivered to Site 19. It arrived in a plain padded envelope with an unidentifiable postmark. It contained a note handwritten in blue ink that read "Enjoy your purchase!" There were no fingerprints, hairs, or other clues that might lead to a profile of the seller. When revisiting the auction site to leave feedback, it was found that the seller's account had been deactivated and deleted. The seller's identity remains unknown, and the check for the item has never been cashed (per accounts payable policy, it has been voided since 90 days have elapsed).
Doctor ████ █. ███████ was selected to make the initial assessment the object and determine its anomalous properties. Understanding the implications of SCP-XXXX were it to prove correct, he requested that he perform the experiments without the aid of Junior Researchers and maintain sole custody of his notes (copies to be forwarded to head researches weekly). Given the relatively simple nature of the experiments and his long history of loyalty to the Foundation, this request was granted.
Dr. ███████ began testing of SCP-XXXX with five incoming D-Class personnel. He applied SCP-XXXX to each and recorded the numbers that were displayed. He noted that instead of counting forward, the display counted backward. He determined that the second row corresponded to the typical digits of a watch (HH:MM:SS). He extrapolated that the top row corresponded to years, months, and days (YYY:MM:DD), but at that time, the personnel had zeroes in the "Year" and "Month" areas.
Experiment Log 1:
Readings taken on June 8, 20██, 08:00
Subject: D-2356
Reading on SCP-XXXX: 000:00:04:12:56:40
Subsequent Events: Casualty as a result of incident with SCP-173
Declared Dead: June 12, 20██
Subject: D-2357
Reading on SCP-XXXX: 000:00:01:08:12:11
Subsequent Events: Terminated in non-SCP related incident (See Report 060943-C)
Declared Dead: June 9, 20██
Subject: D-2358
Reading on SCP-XXXX: 000:00:07:01:57:06
Subsequent Events: Casualty as a result of experimentation with SCP-668
Declared Dead: June 16, 20██
Subject: D-2359
Reading on SCP-XXXX: 000:00:07:01:56:44
Subsequent Events: Casualty as a result of experimentation with SCP-668
Declared Dead: June 16, 20██
Subject: D-2360
Reading on SCP-XXXX: 000:00:19:22:01:09
Subsequent Events: [DATA EXPUNGED]
Declared Dead: June 29, 20██
Surveillance time stamps provided exact times of death, proving SCP-XXXX's accuracy down to the second. There was some confusion regarding D-2360 as she was apparently dead days earlier than SCP-XXXX indicated, but an autopsy revealed that she was technically alive for some time after [DATA EXPUNGED]. Her actual time of death, so far as it could be determined, matched SCP-XXXX's prediction.
After the initial tests, Dr. ███████ requested an extension of the experiment to include a larger sample of incoming D-Class personnel to Site-19. He received approval, provided that he not divulge any results to other researches outside his weekly updates to his supervisor. This restriction was deemed important to avoid biasing experiments. He was also explicitly prohibited from testing on any person not part of the incoming D-Class pool.
Over three months, Dr. ███████ processed 189 D-Class personnel before his abandonment of the project. In every case, SCP-XXXX showed perfect predictive powers. It was noted by his colleagues that Dr. ███████ began to show signs of psychological distress around mid-September such as irritability and secretiveness. Nevertheless, his updates to his superior continued, and his work on SCP-XXXX and his other projects was unaffected.
Dr. ███████ disappeared with SCP-XXXX in hand on October 1, 20██, immediately before quarterly reviews. He was apprehended on November 29, 20██, by MTF Iota-10 ("Damn Feds"). In subsequent interviews, Dr. ███████ admitted that he had tested SCP-XXXX on himself on September 12, 20██, in spite of explicit directive against doing so. SCP-XXXX indicated that he would die on December 5, 20██. The unerring accuracy of SCP-XXXX lead to a decline in his mental health in spite of his previously strong psychological stability scores.
His termination was originally scheduled to December 5, coinciding with SCP-XXXX's prediction. Dr. ███████ requested that it delayed for one day, and that he be kept in a secure cell in a final attempt to determine if SCP-XXXX was accurate. This was agreed to.
On December 5, Dr. ███████ died of pulmonary embolism at the time determined by SCP-XXXX. It is currently unknown if SCP-XXXX has a means of influencing events. Regardless, given the extreme psychological hazard SCP-XXXX presents to even strong-minded individuals, it is recommended that research only be done under the strictest supervision. The temptation to view one's own remaining lifespan is understandably great, but that knowledge will in most circumstances cause crippling mental stress.
Notable Experimental Results from July 1 through September 30, 20██
Subjects: D-2381, D-2384, D-2398
Reading on SCP-XXXX: All showed 999:99:99:99:99:99
Subsequent Events: All three disappeared from this reality when [DATA EXPUNGED].
Subjects: D-2412
Reading on SCP-XXXX: Showed 229:05:30:09:47:12
Subsequent Events: D-2412 vanished during experiments with SCP-███.
Subjects: D-2570, D-2571 (Final test subjects)
Reading on SCP-XXXX: D-2570 showed 000:00:05:13:03:22; D-2720 showed 000:00:00:00:00:31
Subsequent Events: Dr. ███████ immediately produced a concealed pistol and shot D-2570 in the head in an apparent effort to disprove SCP-XXXX. D-2570 survived for an additional five days and thirteen hours, albeit in a comatose state. In the struggle with security guards, the gun discharged again, this time killing D-2571. Dr. ███████ was to be remanded to the Ethics Committee after this incident, but he disappeared the next day. Dr. ███████'s notes indicate the desire to further test the limits of SCP-XXXX, including decapitation, incineration, and other means of guaranteed death against those which SCP-XXXX indicated would have a longer lifespan.