10K at 10C: the Cold-Water Marathon Swim
For a couple years I've been bouncing around the idea of 10K @ 10C as an interesting benchmark of "cold-water" marathon swimming. Similar to "1 mile at 5C" for ice swimming, or 5:00 for 500 yards in American pool swimming, or the 3 hour marathon (run), etc.
Swim 10 kilometers in water 10 Celsius / 50 Fahrenheit or cooler, unassisted by significant currents or nonstandard equipment.
Not saying it's a good idea - for anyone not properly trained, it's a monumentally stupid idea, and you will probably die trying.
But still.... an interesting benchmark, and a small handful of folks have done it - perhaps even a few on this Forum.
If you've done 10K at 10C (50F), this is an invitation to post your details - name, date, location, route, water temp, time in water. Pics? Marathon swimmers' honor system applies!
For others perhaps it offers a unique challenge to build up to, and, depending where you live, don't even have to travel far to attempt.