I've always wondered why they continue building submarines instead of ROVs. I'm a little bit biased as I work for an ROV company, but it seems silly that you'd go down so deep (somewhat "dangerously" as well) for the experience of breathing bad air in a cramped smelly place to look out of a tiny window (since glass/plastic has to be ridiculously thick to have 1 atmosphere at those extreme depths) or video cameras, when you could do the same thing from the surface on a boat. Perhaps this technology is significantly better than the manned vessels they used during the Titanic recovery (where these stories of the manned exploration that deep come from), but it doesn't make sense to me. I suppose there's the whole "I got to experience it" thing, like people that want to go to space have, but it's not quite the same thing.
