SCP-2429-JP
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SCP-2429-JP individual photographed in the deep sea

Item #: SCP-2429-JP

Object Class: Keter

Special Containment Procedures: Securing and containing SCP-2429-JP will be extremely difficult due to its anomalous nature, so the measures to this object is to be focused on reducing and maintaining the total population of SCP-2429-JP. The distribution of the SCP-2429-JP population is to be observed and remotely operated torpedo launchers are to be dispatched to the SCP-2429-JP habitat to terminate the SCP-2429-JP individuals. This action is to be continued until the total population of SCP-2429-JP is reduced and maintained at less than 1,000.

SCP-2429-JP individuals can be recovered after being anesthetized in the deep sea and contained in a water layer with equal water pressure to their habitat. Currently, 2 SCP-2429-JP individuals are being contained in a special aquarium-type chamber1 at Site 81██ for the purpose of ecological research. Future plans for capturing new wild individuals, and breeding with the currently contained individuals have been frozen.

Description: SCP-2429-JP is a spherical organism that lives in a bathyal zone2 at a depth of about 2,500m in the Sea of Japan. Genome analysis has shown that SCP-2429-JP is closely related to organisms in the Tetraodontidae family of the order Tetraodontidae. The following are the main characteristics of SCP-2429-JP.
Main characteristics
Length Larva: about 1cm, Imago: about 20cm
Morphological Features Spherical and has a luminescent head3. No spines present on body surface.
Anatomical Features The lateral muscles used to deform the body for propulsion have degenerated, and the flexor muscles used to move the dorsal and caudal fins have developed instead. The body is non-toxic.
Life Span About 9 years4
Reproductive Features Oviparous, hermaphroditic
Number of Eggs Laid Approximately 30,000 eggs per spawning5

SCP-2429-JP possesses the ability to voluntarily expand the volume of its organ considered to be digestive tract (hereinafter referred as SCP-2429-JP-1) by anomalous means, and the inside of SCP-2429-JP-1 changes into an anomalous space whose volume greatly exceeds what can be estimated from the appearance of SCP-2429-JP when it expands6. By enlarging the volume of SCP-2429-JP-1 and greatly reducing the pressure within SCP-2429-JP-1 relative to the outside of the body, SCP-2429-JP can suck other organisms and objects with the surrounding seawater from its mouth and store them within SCP-2429-JP-1. In this case, the weight of the SCP-2429-JP individual itself will not change. In addition, even if the object to be sucked is clearly larger than the length or mass of SCP-2429-JP, it will be easily sucked and stored within SCP-2429-JP-1.

After the sucked object is stored within SCP-2429-JP-1, SCP-2429-JP gradually shrinks the volume of SCP-2429-JP-1 to its normal amount and increases the pressure inside, thereby squeezing and crushing the object within SCP-2429-JP-1. Since the pressure is applied from the outer edge of SCP-2429-JP-1 to the center, the gradient of water pressure prevents the stored object from moving toward the mouth of SCP-2429-JP individual to escape from SCP-2429-JP-1 and toward the outer edge of SCP-2429-JP-1 to attack the inner wall of SCP-2429-JP-1. Among the crushed objects, the bones, teeth, clothes, machines, and other indigestible materials are discharged from the anus7 of SCP-2429-JP along with a large amount of seawater, so it is assumed that this series of phenomena is a predatory act of SCP-2429-JP. The act of expanding the volume of SCP-2429-JP-1 by SCP-2429-JP is also used as a means of intimidation and counterattack when SCP-2429-JP is attacked by other creatures or humans, and the act of discharging seawater after the volume of SCP-2429-JP-1 shrinks is also used as a means of transportation and internal osmotic adjustment.

When SCP-2429-JP-1 is damaged by an external attack or exposed to body of water8 or space of lower pressure than its normal habitat, it will rupture due to the inability to operate the volume within SCP-2429-JP-1 normally. The impact of the rupture is approximately 9.2×10█J, which is equivalent to ██t energy released by a TNT equivalent explosion, causing severe damage to the organisms surrounding the ruptured SCP-2429-JP individual. In addition, the attempt to contain the SCP-2429-JP individual in a sealed container with the same water pressure as the normal habitat area resulted in SCP-2429-JP-1 being ruptured due to the compression from the sealed container caused by the SCP-2429-JP individual itself sucking in its surroundings. As a remedial measure, it was anesthetized on site to prevent the SCP-2429-JP individual from voluntarily changing the volume of SCP-2429-JP-1, and was transported to Site 81██ after being contained in a sealed container with the same water pressure as its normal habitat.

Deep-sea manned research vessel owned by the National Research and Development Corporation [REDACTED], which was investigating the waters of the Sea of Japan at a depth of 2,500m captured a luminous organism believed to be the SCP-2429-JP individual, and when they attempted to capture it, the research vessel was sucked by the SCP-2429-JP individual and stored within SCP-2429-JP-1 on August 18, 19██. This incident that resulted in the loss of communications culminating in a video and audio recording of the vessel being wrecked later brought SCP-2429-JP to the attention of the Foundation. The Foundation's agents replaced the records and administered Class A amnestics to those involved, and the cover story "Hull Defect" was developed. The Foundation's deep-sea research vessel surveyed the area where the incident occurred and found the wrecks of the deep-sea research vessel and bone fragments presumed to be from the 3 crew members9, which had been sucked into the SCP-2429-JP individual.

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