Board Thread:General Discussion/@comment-262546-20150913044941/@comment-1298029-20151026004925

Well, #1 I think we all know that the Stargate universe is not that big on continuity and logical consistency. If this bothers you, try e.g. Babylon 5 for a truly robust continuity. :-)


 * 2, if the Wraith took out the city shield underwater after the Ancients left, the city would be destroyed (which they probably knew) without the rising failsafe, which they didn't know about, so with what they knew they couldn't have hoped to capture the city that way. Also, once the Ancients left, the Wraith probably lost interest in Atlantis (big army difficult to feed for long, city not a threat any more, and they didn't know about Earth at the time and so had no reason to seek its address and/or Ancient hyperdrives in Altantis).


 * 3, the Wraith might not have had the technology to build attack subs that would be a serious threat to the Ancients. The Puddle Jumpers and drones work underwater, so the Ancients' disadvantage there would've been minimal; the Wraith had trouble fighting the Ancients in space (they only made any headway due to their immense numerical advantage), so they might've had even more trouble underwater.