The President (or maybe Anheuser?) states that four were done, when Dr. Helmsley reports that the apocalypse is arriving ahead of schedule: 3, 4, 6, and 7. 3 was damaged during the earthquakes, leaving only 4, 6, and 7 seaworthy when the tsunami struck. The Chinese built the arks, financed by the G8.CaptainChewbacca wrote:The deal with Africa was that it didn't FLOOD, which means it had the most immediately useable terrain.
Were only 3 of the 8 arks done? I got the feeling 7 of them were set out and launched.
As far as surviving the super-wave? It was fairly ridiculous that a wave like that capsized anything in the deeper sea (like the cruise ship). At anything approaching oceanic depth, a wave like that would be a very long-wave phenomenon. No curler, and definitely no cavitation at the foot of the wave (as was clearly visible during the cruise ship's capsizing). These features of a wave only appear when the water column's height significantly exceeds the depth of the ocean it moves through, and in order for that to happen at oceanic depths, well, we're talking "a chunk of the ocean just boiled off from direct magma contact" levels of fault uplift. The short version here is that the wave as depicted in the deep ocean would simply not occur as such, and any ship (including submarines) a reasonable distance away from the continental shelf would survive easily.
As previously noted, this is far from the only thing scientifically disastrously wrong.
Good news, though! Roland Emmerich is going to make a TV series taking place after the movie!