corrupted .fit file

I am hoping to see the tracker for my big event, 8 hours swim across Lake Tahoe. On finishing, after clicking, the watch was on 'resume', and switching to 'save' was all the battery had and it died. I tried using a fix application, but it didn't work for me.

 http://garmin.kiesewetter.nl/

Thanks for any help. Much appreciated!
Tim2022-07-30-03-55-29.fit.zip