​If there is any warning at all, you must turn off the gas and electric to your property, then immediately get inside your shelter and secure it. The heat and blast will set fire to your gas supply if it is turned on. You may only have 2-4 minutes to do this. There will be 10 seconds of searing heat that will set fire to everything in its path. You must be in your shelter and protected when this happens. 

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As it gets closer to a time where you feel an attack is imminent then it may be prudent to turn off electric and gas before sleeping. If an alert happens as you sleep, there may not be time to wake up, come to your senses, and do this, before detonation.

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There may be multiple detonations. The detonation closest to you will be catastrophic. You will be lucky to survive, but will have a chance if your shelter and planning are adequate. 

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If caught outside, and away from your shelter, the heat and blast will either:

1. Kill you immediately

2. Cause catastrophic, painful injuries, that likely you will need to deal with yourself

3. Cause a dose of Gamma radiation poisoning that kills you within hours, days or weeks

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It is unlikely you will survive if caught outside and within a few miles of the detonation.

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Outside or inside, shielding your eyes from the flash of blinding light is paramount. You will risk temporary or permanent blindness if you don't. Also, laying down on the floor will help avoid the shrapnel of flying debris, especially glass. Keeping your mouth open will also help to protect against burst ear drums.

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It is unlikely your vehicle will work due to the Electro Magnetic Pulse (EMP) produced by the detonation. But your best chance of survival is still to get home before the fallout starts to rain down. If you are not within 10 minutes walking distance of your home it would be best to stay in your location and hope you are protected enough from the fallout for at least 48 hours and enough water for you and your colleagues to drink.

 

The world around you will be on fire. Toxic fumes likely. Lack of oxygen due to fire and a risk of suffocation also likely. Roads and pavements possibly running like molten lava. Buildings collapsing all around. Smoke everywhere.

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If you do manage to get inside a building, e.g your workplace, and survive the detonation, your best chance is still to get home to where you know there is a shelter that hopefully survived, and where you know food, water and medical equipment is stocked. Psychologically this is also where you need to be. The route home however may be difficult to navigate. It will likely be unrecognisable. More solid construction landmarks may still be standing visible. Hills and mountains too if not obscured by fire and dense smoke. These may give some sense of direction.

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Adrenalin will fuel your responses. You may not even notice injuries or burns received until the adrenalin wears off. 

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