Well, we explored this drain on Saturday but, unlike the people who posted the location in the DB, we did not really find any of those cool spots. We did find a small area with brick and wanted to go further but at that point the bugs got a little heavy and we decided to turn back since we didn't have our head covered to avoid getting bugs down our clothes! haha
Not to mention, those tunnels are fairly small and myself and another guy in the crew are over 6', so we'll actually have to physically crawl through them.
We are planning a return trip to go through the brick area when we're better suited up to avoid any creepy crawlies going down our shirts, etc. We took a couple of pics, but nothing really worth mentioning.