Further analysis on key points by Q:
"Reverse image search."
The RIS returns no results, which is Q's way of confirming the image, at time of writing, was original.
The submarine appears to be an older Ohio-class submarine (soon to be replaced with the Columbia-class submarine), which is capable of firing ICBMs with nuclear warheads: basically, what Q is saying is someone tried to trigger WW3 with the 'remote hack spoof' (IE you hijack someone else's military systems to attack someone else in order to trigger war).
https://en.wikipedia.org/wiki/Ohio-class_submarine
https://en.wikipedia.org/wiki/Columbia-class_submarine
https://qanon.pub/data/images/dbc20d6d7aa5e4cbde931c380de1cdcb10baa92ed2127b5cbd9d2926313a52f2.jpg
(You can tell which by observing the conning tower's anteanna and the forward bow's shape, plus the general age architecture of the sub in the original photo)
Q said: "Think hack."
This (hacking) is actually a hypothetical scenario I proposed (albeit my version was false attribution cyber-attacks by a rogue AI to trigger WW3). Nothing to say a human couldn't do it though, hence why I warned about it.
Assuming the Ohio uses 'Windows XP' like the British Vanguard-class vessels do, then I had warned that 'being out of at sea' or 'underwater' was no immunity to being hacked (hint: consider inside mole: wifi + laptop + boarding pass = party time). Remember, some code can be 'delayed' to run until a later time (they only need to obtain prior access to pre-set coords and launch time). So again, being out to sea no immunity.
https://www.popularmechanics.com/military/weapons/a19061/britains-doomsday-subs-run-windows-xp/
My recommendation was a switch to a more secure Linux OS, but the comment I got back was 'but some commercial apps run on Windows'. Tough: switch the fuck over, these are nukes we're talking about, not a smartphone, loss of functionality to improve security on a nuclear design is to be expected (in future: use more secure OSes). OpenBSD is the most secure but also the damned hardest to use; but even 'systemd using Linux' is an improvement to 'won't fix moderate and below bugs' Microsoft Windows.
By "extinguished", Q means the missiles were aborted. There's no guarantees this will happen again in future.
Protip: strongly advise you consider the possibility of using your own missile defence tech against your own nuclear missiles as another fail-safe plan. In the interim, either unload the missiles or keep subs at depths below launch capacity.
If someone is trying to false-attribution trigger WW3, the counter is honesty: you need to work out who the target was (most likely: Russia, China, North Korea - no guarantees though, could be anyone, don't assume), and then phone said target, let them know someone tried to hack your systems to attack them.
Yes, embarrassment, but you could also be averting a diplomatic crisis down the line if a missile got close and they intercepted it (because at least it won't be an 'excuse' as they would have been told in advance). Keep whoever it is up to date with your discovery of who do it.
I'm pretty sure Russia & Co will be smart enough to know if you did plan to pre-emptively strike, it would NOT be with some straggler single missiles.
Be aware: US isn't the only one with nuke subs, so whoever tried to start this war (likely those who profit) might target another country's. Advise all missile defence platforms to shoot down any ICBMs that do not have prior clearance - even allies/your own.
Goddamn this is high stakes.