“Don’t worry,” he typed in what would be a final email to his wife in April. “Everything will be fine.” Last month, the ship, by then floating off the United Arab Emirates, sent what had become a familiar plea. Captain Sandu was dead and his body was in the ship’s walk-in freezer. For six months, it had traveled thousands of miles lying near the crew’s meat and vegetables. They needed to get him back to Romania. ...There currently are four seafarers’ bodies stuck aboard cargo ships, the International Maritime Organization says—as well as 36 urgent cases involving medical or humanitarian...