(Note: If you're buried alive and breathing normally, you're likely to die from suffocation. A person can live on the air in a coffin for a little over five hours, tops. If you start hyperventilating, panicked that you've been buried alive, the oxygen will likely run out sooner.)
And the average volume of a human body is 66 liters. That leaves 820 liters of air, one-fifth of which (164 liters) is oxygen. If a trapped person consumes 0.5 liters of oxygen per minute, it would take almost 5 and a half hours before all the oxygen in the coffin was consumed.
Buried in a Coffin
On average, a person's volume is 66 L, and the average casket holds 886 L: The leftover 820 L of air, 164 L of which is oxygen, is yours to ration.
While there have been many stories written about people digging their way out of the grave, there do not seem to be any confirmed cases of anyone surviving premature burial. Even with the best training in the world, that's a lot of earth to move.
If you are looking at a long-lasting ground casket, pick a steel or metal casket. If the grave site is low on water content or moisture, metal caskets are known to last even longer, over five decades. Under favorable weather conditions, experts say that metal caskets may even last more than that – up to 80 years.
Coffins are not watertight so when the grave fills with water it also fills the coffin, which decomposes and rots the bodies faster. In my opinion this is where the water mixes with the body and embalming fluids," he explained.
As those coffins decompose, the remains will gradually sink to the bottom of the grave and merge. The coffin at the bottom will often be the first to collapse and may pull down the remains above it.
Wooden coffins (or caskets) decompose, and often the weight of earth on top of the coffin, or the passage of heavy cemetery maintenance equipment over it, can cause the casket to collapse and the soil above it to settle.
(Note: If you're buried alive and breathing normally, you're likely to die from suffocation. A person can live on the air in a coffin for a little over five hours, tops. If you start hyperventilating, panicked that you've been buried alive, the oxygen will likely run out sooner.)
In 1992, escape artist Bill Shirk was buried alive under seven tons of dirt and cement in a Plexiglas coffin, which collapsed and almost took Shirk's life. In 2010, a Russian man died after being buried alive to try to overcome his fear of death but was crushed to death by the earth on top of him.
While some people find comfort in seeing their loved ones as they remember them, it may also be uncomfortable to others. If they have an open casket viewing, make sure you follow proper funeral etiquette: DON'T touch the body under any circumstances. Sometimes the casket has a glass to prevent this from happening.
Anything combustible - like bottles of alcohol, or lighters. Pacemakers - they're removed before funerals because they can explode during cremation. Anything made from treated materials like leather, latex and vinyl - they can release fumes that are harmful to the environment. Jars or bottles made from plastic or glass.
And superstition says that bodies should leave a house feet first so that the corpse cannot look back. The fear is that the spirit of the deceased may catch the eye of a living inhabitant and beckon them over to the other side.
Over time, coffins underground will decompose and eventually collapse. Covering the face before closing the casket adds an extra layer of protection and dignity for the deceased's face and can act as a symbolic final goodbye.
What's really returned to you is the person's skeleton. Once you burn off all the water, soft tissue, organs, skin, hair, cremation container/casket, etc., what you're left with is bone. When complete, the bones are allowed to cool to a temperature that they can be handled and are placed into a processing machine.
Medical schools in the early 1800s bought cadavers for anatomical study and dissection, and some people supplied the demand by digging up fresh corpses. Gravesites reaching six feet helped prevent farmers from accidentally plowing up bodies.
Coffins and caskets alone, on average, can weigh around 25-40kg, but can weigh up to 100kg. The actual weight including the deceased will, of course, vary. We would suggest that only those of a reasonable level of fitness and the confidence to carry at least 25kg take on this important role.
It's an understandable worry, but cemeteries in London can only reuse graves that are at least 75 years old. In the past, many graves were sold in perpetuity, but the Greater London Councils Act 1974 means this right can be reversed. Now, most graves are sold for between 10 and 100 years.
After a few weeks, nails and teeth will fall out. After 1 month, the liquefaction process commences. During this stage the body loses the most mass. The muscles, organs and skin are liquefied, with the cadaver's bones, cartilage and hair remaining at the end of this process.
The exclusive right of burial (or grave deed) is sold for 75 or 99 years. For a cremated remains plot, the exclusive right of burial is sold for 75 or 99 years. These are known as 'purchased graves' and although you never actually own the ground you do own the exclusive rights to bury in your purchased plot.
No running, yelling, or rolling around on the ground. This is not a place for childhood games. Don't let them play on any of the monuments. While it is good to get children used to paying respects at a cemetery, they often don't fully understand the meaning of everything in the cemetery.