Does 'During the first broadcast, the captain or first officer could be heard declaring Mayday amid the sounds of a physical struggle in the cockpit.' neither support nor refute 'The captain or first officer declared Mayday in the cockpit.', instead existing independently?
During the first broadcast, the captain or first officer could be heard declaring Mayday amid the sounds of a physical struggle in the cockpit.###The captain or first officer declared Mayday in the cockpit.