They had to go back to port to fix it (this wasn't the first time that this type of thing happened.) They were suppose to start the 6 months out to sea on or near January but since it would not submerge they had to go to port and fix it.
And fix it they did, apparently.
That one of the navies newest subs. If that can not submerge that much what makes you guys think the older subs can do better?
Ummm because I've participated in exercises with them, and been onboard them while they submerged?
USS Cheyenne is the newest Los Angeles class attack sub. I've been on/exercised with at least three other LA boats, and they were definitely submerged. Perhaps you should aim for a little perspective, that some problem you heard about with a single submarine that made it non-diveworthy is considerably different than a fleet of submarines that have systemic maintenance and reliability problems. The US hasn't lost a submarine since 1968, the Russians have lost three since then and had numerous other problems.
BTW truth >>>>>>>> leaking classified info
Sure, but anecdotes =/= truth.