First, it just felt a little claustrophobic (and I do not suffer at all with claustrophobia), second, the guide did talk an awful lot about the barf bags and how if you are gonna do it make sure to use the bags cause he wasn't going to clean it up. Being in that small space with barfing people and no escape sounded like hell so we started the trip with a bit of dread on my part. Thankfully no one got sick. I did feel slightly off, but not sick. I was more than happy to be back in the light and fresh air again. Lastly, the sights were not impressive. The structures they placed down there in water weren't anything to look at....it came across as just rebar and random junk, and the fish we saw were mostly the normal grey variety, unlike the colorful fish we saw for free at Hanauma Bay.