Not as terrible as everyone is saying in my eyes. I was interested enough to continue watching just because of all the equipment they use in it is time accurate. The tension is all determined by small scientific problems and therefore comes off as anti-climactic. When the audience doesn't know the science behind the peril you have to explain it in a better and more time-pressing manner. They did not succeed in this. Long and dragged out is definitely how this feels but as I would sit through even a documentary on this subject matter I found myself intrigued the whole time. If you like Ernest borgnine and miss the days of Voyage to the Bottom of the Sea and the like then this one really isn't all that bad. However if you're easily bored... Give it a pass.