Between the evening of March 29 and the early hours of March 30, 2026, DeepSeek, a prominent provider of AI large-scale model services, encountered an abrupt and extensive service outage. Both its web-based and mobile application platforms were rendered inoperative, causing users to face login failures, interrupted conversations, and loss of content. The incident sparked widespread discussion on social media, with related topics trending prominently. The service disruption commenced at 21:35 on the 29th, and despite two emergency repair attempts, full service restoration was not achieved until approximately 10:00 on the 30th. The entire ordeal spanned nearly 12 hours, marking the longest single service interruption in DeepSeek's operational history. This event not only impacted a significant user base but also highlighted underlying issues concerning the imbalance between computing power supply and demand, as well as system reliability challenges within the AI sector.