Dark swim
From Openwaterpedia
noun - A dark swim or night swim is an open water swim performed by open water swimmers completed partly or entirely at night in the darkness after the sun sets and before the sun rises. The open water swimmers can be escorted as in a marathon swim or channel swim with a paddleboard or kayak or unescorted as in a wild swim or expedition swim.
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Usage
The swimmers in the S.C.A.R. Swim Challenge did the last stage swim as a night swim.
Synonym
Origin
Coined by Steven Munatones in 1979.