Chicken-Little-of-the-Sea
From Openwaterpedia
noun - Chicken-Little-of-the-Sea is an individual who informs his open water swimming colleagues that the water temperatures are falling.
Origin
First used by Lynn Kubasek circa 2013 and named after the folk tale of Chicken Little, a chicken that believes the world is coming to an end. The phrase "The sky is falling!" features prominently in the story.