Lemuria 7 Is Missing
Novella 21,450 words Recommended by 4 award/anthology sources
"The history of sea and air travel is replete with mysterious disappearances. Since the times when Egyptian galleys and Phoenician trading vessels sailed the Mediterranean, ships have set out upon sun-freckled waters, their captains and crew confident in the belief that nautical skill, favorable winds, and the mercy of the gods would guide and protect them in their travels."
Quasar links out; the story lives on Asimov's, where the author gets the click.