Rescue boat and fishermen at sea. The collapse of the sea. A sinking ship. Shark. Fishing net. Rescue at sea. Lifeguard boat. Swimmer 矢量插图。海上救援船和渔民。大海的崩塌。一艘正在下沉的船鲨鱼。渔网。海上救援救生员船游泳 运动员。海岸安全