A serious boat crash occurred in Hingham Bay, Massachusetts, when a speedboat collided with a sailboat, resulting in significant injuries to two individuals. The sailboat sank following the incident, prompting a large emergency response from local firefighters and the Massachusetts Environmental Police. Witnesses described the scene as unusual, noting the sailboat's mast was visible above the water after the collision. The incident, which took place near Grape Island, is currently under investigation to determine the cause of the crash. First responders emphasized the importance of safety measures on the water, including the use of life preservers and maintaining a safe speed. The submerged sailboat poses a navigation hazard in the bay and will be recovered by a towboat.