This story contains spoilers from the documentary “The Deepest Breath.” In 2017, Laura McGann read a story in the Irish Times about a fatal accident involving Alessia Zecchini, a preternaturally gifted freediver from Italy, and Stephen Keenan, a well regarded safety diver, at the Blue Hole near Dahab, Egypt — a notoriously dangerous submarine sinkhole nicknamed the “divers’ cemetery.” Even …
