I've wondered if that section of sewer pipe was still part of the course. As I remember, it was existing from back when Mackall was active. Just conveniently was incorporated into the obstacle course. I remember the first time through, I wanted to go through it. It was nasty hot and humid, figured it would be great to be in some shade.
Yeah, it was shady, but the air was nasty foul and hot. The guy or guys in front of me, just weren't going fast enough. Once in there, I changed my mind and thought it was better to breath the topside thick air.
After seeing Razor's post, I realized at least we didn't have to wear those helmets.......