There is no way I would take a DSLR in that. At most a disposable pocket camera would be used by me.
Just thinking, but how about the underwater rig? They’re really expensive, but for a pro maybe in stock already?
I guess that would be one way to go. Once in a while gig-landing me couldn’t justify something like that.
Here is an example of what I went and found on the course a few blocks up from the finish line that made a few bucks. I visited the site a few times. There was a good perch across the street that put me level with the activity. The 70-300 lens did well.