Comments by "Awesome Avenger" (@awesomeavenger2810) on "Jeremy Corbyn pressed over whether he'd use nuclear weapons - BBC News" video.
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Trident is a submarine based weapons system. There is always at least 1 sub somewhere under the sea. The very minimum required is a fleet of three vessels. This is so that if one or two is in need of repair, there is always one out on patrol.
There always needs to be at least one out on patrol. Because in the event of a nuclear attack it would be too late to launch a sub. Not only that, but if during heightened tensions with a possible enemy it were known that nuclear armed subs were being sent out, it would heighten tensions all the more.
The subs constantly monitor news and current events so they know what's going on. There is a set of procedures that the crew will go through in the event that the UK has been hit. One, I believe, is to check if BBC Radio 4 is still broadcasting. But its obviously far more than just that.
In the event of a nuclear attack on the UK, the subs captain goes to a safe in his cabin. Opening the safe he will find the launch codes and a letter written by the prime minister. When a new prime minister is elected, this is one of the very first things he or she must do.
What the letter says is never divulged. Only the prime minister knows what is says. And when a prime minister leaves office, it is destroyed without being read. The letter will be the prime ministers last instructions on what to do in the event of a nuclear attack on the UK.
It might say launch a retaliatory attack. It might say don't launch a retaliatory attack. Or it might say go to the nearest friendly port and put your vessel under the command of an allied power. Pretty sobering stuff.
But then the defence of 60 million people isn't to be taken lightly in a world were less friendly nations are also armed with nuclear weapons. The idea of a nuclear deterrent is not to be used. But to deter. If an enemy nation thinks that there is a good chance that if they launch a nuclear attack on the UK, then the UK will respond with a nuclear attack of its own (regardless of the UK no longer existing), it makes a nuclear attack on the UK far less likely. So trident does it's job just by being there.
Obviously, if the UK didn't strike back, then the rest of the world would be faced with how best to deal with an aggressor nation that launched a first strike and got away with it. Having already launched a first strike, it would be likely that those countries closest to it would very quickly capitulate.
What other nuclear armed countries like the US or France would do is anyone's guess. But if the UK failed to act in its own defence it might possibly be the case that no one else would act in the UK's defence either. If they did launch a retaliatory attack in defence of the UK, well, then most likely they too would be targeted. So you have three nuclear attacks instead of two. What the world would look like after that idk.
If you are prime minister, these are things you actually have to think about. Like I said, one of the very first things a new prime minister does is to sit down and write that letter. So those questions are important. But the only use of a nuclear deterrent is that it deters. It doesn't deter if you tell everyone you would never use it. So, in the event you know for sure you would never use it. And you put that in writing to the captain. What is stopping you from lying and saying you would?
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