Check back with the NASA website, as they constantly update close calls. Make sure to prepare well in advance. Sometimes astronomers know about potential impacts on the earth only a couple months beforehand.

The tsunami in India in 2004 killed 150,000 people in a single day with many more left missing. The results of a tsunami from a large comet impact would be even worse. Even if you had an impenetrable bunker near the coast, massive flooding would mean you could never leave it.

If you can’t find a bunker, try to find another location that’s going to be unaffected by the impact. This could be a cave or another natural structure that would shield you from the initial blast. There are many different bunker options available, but the best ones for a comet impact will have an air filtration system and be made of strong material. Bunkers can be expensive and range from anywhere from $20,000 to a million dollars and upwards.

Make sure to stock your hide-out with canned food, dried goods, non-perishable foods, and bottled water. If there is more than one person staying in your location, make sure that you increase the amount of food you are storing accordingly. The average calorie intake for men is 2,500 calories a day and 2,000 calories for women. [8] X Research source

Don’t go overboard on purchasing guns - make sure that you have things like food, water, and shelter before spending money on protection. A semi-automatic rifle and a pistol with enough ammunition should be more than enough firepower.

Dried legumes, canned beans, and dried meat products provide the most protein and can be stored for a very long time. Nutrient-rich grains and potatoes can also provide needed calories, so make sure to be stocking up on these kinds of food. [9] X Research source As a rule of thumb, try not to dip below 500 calories a day. While humans are capable of surviving without food for up to 40 days while hydrated, not eating enough will deteriorate your body and mind. [10] X Research source Make sure you are eating the right kind of foods so you don’t suffer from malnutrition.

It’s a good idea to have more than one generator in case your primary generator breaks. Equip your hide-out with generator repair kits for possible repairs that will be needed.

Don’t believe everything you hear. Early reporting is notoriously inaccurate at times, so wait it out until you hear unified reports. [11] X Research source The National Weather Service broadcasts emergency broadcasts on the VHF public service band, which require a special radio receiver. These channels range from 162. 400 to 162. 550. [12] X Research source

While you ration your food and water you’ll probably want to keep physical activity low, but you should also make sure not to become frail while in your bunker and try to get exercise in if your food stores will allow it.

Isolation has multiple negative effects on your mental health, so having people with you is a good idea if you want to stay mentally healthy. [13] X Research source

Have a reason to go outside, like being out of food or supplies, or hearing about other groups of people who survived and wanting to join them.

Make sure that you are not stealing from anyone and that the goods have been abandoned by their previous owners to avoid confrontations. There is a chance that the location you try to scavenge in has already been sorted through, depending on the length of time you’ve been hiding out.

Always try to resolve things peacefully, not violently. There may be other groups willing to share resources as long as you share yours. Always approach people cautiously, but not in a hostile manner.

Having more people in your group will allow you to search for food more effectively. Moving near a large body of water will allow you to fish. Use survival guides to determine what foliage is good to eat and what is poisonous.

As your group gets larger, the governance system becomes more critical. Make sure to hold everyone to the same standards.