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Following Addendum 8121-4, precise measurements are to be taken of SCP-8121's size every month.
Description: SCP-8121 is a pin-sized circular hole, approximately 8mm in diameter, that appears to be infinitely deep. Despite its apparent depth, SCP-8121 does not interfere with any material behind it; instead, it presents as an independent void in physical space. Testing has revealed that objects inserted into SCP-8121, except for living tissue, are completely lost as soon as the object is no longer visible, with no means of retrieval.
The primary anomalous property of SCP-8121 is its ability to be relocated by inserting any object small enough into the hole and physically shifting its position. Regardless of the surface upon which SCP-8121 is located, it moves effortlessly with the motion of the object inserted. This effect has been tested on various materials, including concrete, glass, and steel, with no noticeable resistance. SCP-8121 remains fully functional and retains all anomalous properties regardless of its new position.
Attempts to cover or seal SCP-8121 have been unsuccessful. Any material placed over it will detach and fall away after 2-4 hours, seemingly cut cleanly around its edges as though the hole forcefully expels obstructions. The exact mechanism behind this effect remains unknown and is likely anomalous in nature.
Addendum 8121-1: Discovery SCP-8121 was first discovered in a sewer system beneath London after a civilian reported dropping a ring into an unusually deep hole in the floor. Upon attempting to retrieve the ring, the individual found that the hole appeared bottomless and that attempts to obstruct it were futile. Word of the anomaly spread through local circles, eventually reaching Foundation personnel embedded in urban infrastructure management. An investigative team was dispatched under the cover of city repair services.
Initial skepticism quickly faded as on-site tests confirmed SCP-8121’s anomalous properties. Notably, an agent inadvertently discovered its mobility while attempting to mark the surrounding area with chalk. SCP-8121 was subsequently transported by shifting it onto the surface of a wooden crate, which was then loaded into a secure transport vehicle and relocated to Site-44.
Addendum 8121-2: Testing Log Test 8121-03 Subject: 10cm steel rod Procedure: Inserted into SCP-8121 and released.
Result: Rod was immediately lost. No visual confirmation of depth obtained.
Notes: Standard result. No irregularities recorded.
Test 8121-07 Subject: 5cm aluminum sphere, marked with a laser engraving.
Procedure: Inserted halfway into SCP-8121 and observed for 10 minutes before release.
Result: Sphere was lost upon release. However, high-speed footage suggested the sphere subtly distorted before vanishing.
Notes: Unclear if distortion was an optical illusion or an anomalous effect.
Test 8121-12 Subject: High-precision laser measurement Procedure: Using a laser micrometer, the diameter of SCP-8121 was measured at one-month intervals.
Result: Readings fluctuated within a range of 8.01mm to 8.03mm, with no recorded decreases in size.
Notes: Slight increase may be due to instrument calibration errors. No immediate concerns.
Test 8121-18 Subject: 1kg lead weight Procedure: Lowered into SCP-8121 via a thin steel cable.
Result: The cable experienced a sudden severance at the entry point, and the weight was lost. No damage was observed on the severed end.
Notes: Increased loss of mass may warrant further observation.
Test 8121-22 Subject: 20kg block of tungsten Procedure: Pushed halfway into SCP-8121 and held for five minutes before release.
Result: Block was lost upon release. Laser measurements post-test showed a consistent increase of 0.02mm in SCP-8121's diameter.
Notes: Measurements repeated three times to verify. Further testing put on hold, pending review.
Test 8121-26 Subject: Pneumatic piston (gas-powered) used to push an object into SCP-8121.
Procedure: A 5cm steel rod was placed at SCP-8121’s entry point. A pneumatic piston was used to push the rod inside to observe if any resistance or reaction occurred.
Result: The rod was lost as expected. However, the piston unexpectedly failed, showing a sudden pressure loss. Examination of the equipment found no mechanical failures or leaks.
Notes: The piston failure is unusual. Possible equipment malfunction, but further diagnostics yielded no issues. Will monitor for patterns in future tests.
Test 8121-25 Subject: Small remote-operated drone with a high-intensity LED and a fiber- optic camera.
Procedure: Attempted to navigate into SCP-8121 to determine its depth.
Result: Transmission cut off upon full entry. SCP-8121’s measured diameter post-test showed an increase of 0.05mm.
Notes: Dr. Howard suggests we immediately halt testing on SCP-8121.
Addendum 8121-3: [BEGIN LOG] Dr. Howard enters the lab, holding a clipboard, and approaches Dr. Patel, who is reviewing SCP-8121’s latest measurements.
Dr. Howard: You seeing this? SCP-8121’s diameter increased by 0.12mm over the past, well, I'm not really sure. I'd say since testing started, our original measurements have become less reliable.
Dr. Patel: (scoffs) Howard, that’s within the margin of error. We’ve been measuring an 8mm hole with lasers. There’s obviously going to be fluctuation.
Dr. Howard: I don’t know…we’ve never recorded any shrinkage, only growth. What if it’s actually getting bigger?
Dr. Patel: Right. And next, you’re gonna tell me it’s gonna swallow the whole site? Look, we’ll keep an eye on it, but I’m not losing sleep over a tenth of a millimeter.
Dr. Howard: I just think we should- Dr. Patel: (firmly) It’s a measurement error, Howard. Drop it. I don't get why you want testing suspended so urgently.
[END LOG] Addendum 8121-4: [BEGIN LOG] Dr. Howard sits across from Dr. Henshaw, tapping a pen against his notes.
Dr. Howard: Sir, we’ve reviewed every measurement, every test. The more we feed SCP-8121, the larger it becomes. It’s small, but consistent.
Dr. Henshaw: And what’s the rate of expansion?
Dr. Howard: Hard to say definitively, but…every significant test resulted in a measurable increase. Not just fluctuation. Growth.
Dr. Henshaw: Have we determined an upper limit?
Dr. Howard: No, and that’s the problem. We don’t know if it stops. We don’t even know why it’s growing. It’s just…taking. Everything we give it.
Dr. Henshaw: Then we get the site director to halt testing. Effective immediately.
Dr. Howard: Understood, sir. But, I have one last question.
Dr. Henshaw: Go ahead.
Dr. Howard: Can SCP-8121 absorb gases? I'm not sure how we would test that efficiently. I mean, we probably could, but I still don't know whether it would be a good idea to keep testing on that thing. Maybe we should just stick it in a vacuum, see if it stops growing.
(A long silence follows. Dr. Henshaw does not respond.) [END LOG] Addendum 8121-4.1: Post-conversation After this conversation, all testing was halted for SCP-8121. Recent measurements have not shown any increase in the size of SCP-8121.
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