I'm enjoying the show, but this one annoyed me with too many corners cut based on cheapness as far as I can tell.
One long shot of the White House with the Washington Monument in the back is from over 5 years ago. The Michael Graves designed scaffolding from the restoration project is still in place. I guess in theory they're in an alternate universe and their own time, but you can't be in a "post 9/11" world and show outdoor pictures from 1999. Stock photos are OK, but make sure they fit the situation.
If the scrubbers had failed, their problem is too much CO2, not lack of oxygen. The should have left it with a comment about the scrubbers failing and not had someone ask "are those the things that extract oxygen from seawater?". They aren't, they remove exhaled CO2 from the air inside the sub. Five minutes with Google could have set them straight.
The "clock that shows to the second until they die from lack of oxygen" was way too cheesy. Something from a 80's direct-to-video movie not in keeping with a major network primetime series.
The idiot generals were also annoying. Were they supposed to be stupid, or still blocking the president by not coming up with options to save the sub? Borrowing a Chinese sub seemed a stretch already, but not pondering their DSRV was kinda dumb. Even after it was suggested they continued to block the idea saying they couldn't let the sub driver inside their sub, never suggesting they don't enter the sub. I just couldn't swallow the whole exchange.
I'm still hoping the show will find it's stride and be a good one, but last night's episode wasn't a step in the right direction.