Rear-end collision involving three cars in tunnel... 10 injured and transported to hospital = South Korea

Ten people were taken to the hospital after a rear-end accident involving three cars that occurred in the Inje-Yangyang Tunnel on the Seoul Yangyang Expressway in South Korea.
At around 12:58 p.m. on the 23rd, I was on the Seoul Yangyang Expressway in Girin-myeon, Inje-gun, Gangwon-do, heading towards Yangyang.
A rear-end accident involving three cars occurred inside the building. A total of 10 people in the three cars were taken to hospitals in the Sokcho and Gangneung areas, and police have not yet determined the exact cause of the accident.
I'm looking into it. The Inje Yangyang Tunnel connects Kirin-myeon, Inja-gun, and Seo-myeon, Yangyang-gun, and is the longest tunnel in Korea with a length of 10.965 km.