.i imagine the second incident was just badly stowed cargo , wind over tide chucks it around and suddenly shes over before a mayday can be sent , epirbs have to hit the water to activate , so if the crew wernt wearing them , or the ships epirb was somewhere that stayed dry when she went over , they wouldn't activate anyway , on depends where they were , if the crew were off deck and had them on their lifejackets in a watertight locker or compartment then they wouldn't activate , i do wonder weather any crew are inside the boat , in an air pocket or something , even if they were theyd be dead now anyway
RIP