The world-ending threat that could end humanity SCP-001, known as "When Day Breaks," is an XK-Δ-Class "Solar Singularity" scenario where sunlight transforms living beings into flesh-consuming monsters called SCP-001-A. Overview "When Day Breaks" is classified as SCP-001 in the SCP Foundation universe and represents an apocalyptic scenario triggered when the Sun changed from its normal yellow-orange hue to a blood-red color . Exposure to this altered sunlight or moonlight causes any living organism to liquefy and transform into an SCP-001-A instance, which are mindless, flesh-consuming entities . Containment of SCP-001 is impossible, making it a global catastrophic threat. SCP-001-A Instances SCP-001-A are fleshy, aggressive beings with no cognitive function beyond consuming other living creatures . They are highly resilient, and euthanization is ineffective due to their regenerative properties. Large instances can be immobilized using electrical, incendiary, or cryonic weapons, and in extreme survival situations, small amounts of SCP-001-A can be consumed as a last-resort food source Survival Guidelines Survivors are advised to: Wear full-body protective clothing to avoid exposure to sunlight or moonlight. Prefer air travel over surface travel to minimize contact with SCP-001-A. Travel through cities rather than wooded areas, as urban environments offer better protection Maintain contact with secure SCP facilities and attempt to reach Sites 5–19 for safety Scenario Impact The event is considered an XK-Δ-Class scenario, meaning it is apocalyptic and potentially endless. In the first 24 hours after the Sun turned red, billions of living organisms were transformed into SCP-001-A, leaving only a fraction of humanity as survivors . The origin of the Sun's transformation remains unknown, and the SCP Foundation continues to document survivor accounts and strategies for coping with the ongoing catastrophe
