On August 21, 2017, the US Navy destroyer John S McCain was overtaking the Liberian-flagged tanker Alnic MC while both vessels were transiting the westbound lane in the Middle Channel passage of the Singapore Strait Traffic Separation Scheme. The destroyer crew had a perceived loss of steering, and, while the crew attempted to regain control of the vessel, the John S McCain unintentionally turned to port into the path of the Alnic MC. At 0524, the vessels collided. As a result of the collision, 10 John S McCain sailors died, 48 were injured, and the vessel sustained over $100 million in damage. No one was injured on the Alnic MC, and the vessel sustained about $225,000 in damage. There was no report of pollution.