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An unmutated instance of SCP-3035

Item #: SCP-3035

Object Class: Safe

Special Containment Procedures: All known instances of SCP-3035 are currently contained in Site-573, a decommissioned Foundation containment site. There are two entry-points to Site-573: Entry Point A, the primary entrance, has been buried beneath 4 meters of concrete. Entry Point B, a vacuum-tube transit system, is used for deliveries to and from the interior of Site-573.

MTF Epsilon-9 ("Rasczak's Roughnecks") maintains a small base at Entry Point B. They have standing orders to terminate any instance of SCP-3035 on sight.

Approximately once a week, a package will emerge filled with paper (containing unintelligible writing), test-tubes filled with random liquids, (human, non-anomalous) internal organs, and broken keyboards will emerge from Entry Point B. The contents of these packages are to be examined, documented, and then incinerated. No personnel or automated drones are permitted to enter Site-573 without Level 4 Clearance.

Description: SCP-3035 are a strain of Periplaneta americana (American cockroach, or water-bug) with an anomalous defense strategy: They mimic the behavior and appearance of whatever dominant species occupies their current ecosystem.

Typically, this mimicry will be largely superficial. While an instance of SCP-3035 may reproduce the coloration and basic behavior patterns of bumblebees, they will not reproduce a bee's complex social network or unique form of language. This is analogous to insects in nature with appearances that mimic other creatures — thereby gaining the benefits of being misperceived as those creatures.

Instances of SCP-3035 will mimic each other much more rapidly than other organisms. This leads to a powerful feedback loop wherein one instance will adopt a new behavior or appearance, and all other SCP-3035 instances will quickly mimic this new behavior or appearance in return.

It should be emphasized that all of these forms of mimicry are only shallow approximations — representing an attempt by an insect to roughly 'look' and 'act' like something else. However, regardless of the extent of this mimicry, instances of SCP-3035 still retain many of the behaviors expected from cockroaches.


After three disastrous attempts at a rescue mission, we're giving up. Every time we send a squad of soldiers down there, these things start adapting their behavior and appearance — becoming more and more aggressive. On top of that, they breed like… well, cockroaches.

Epsilon-9 will be stationed at Entry Point B; they'll stay as long as they can and wait to see if anything human comes out. But as of this moment, I'm declaring Site-573 a lost cause.

The decision regarding whether or not to deploy nerve-toxins to clear Site-573 of SCP-3035 instances is under review — particularly in light of the recent revelation that some of the organs emerging from Entry Point B are fresh.

- Dr. Henry Xao

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