LOL! So you wouldn't first pop a cap into their heads like me dino thought to write.
Fine, let's ventilate each mass murderer's grave that we bury alive so they won't asphyxiate before having time to worm hunt.
Note #1: A mass murderer's coffin shall require a detachable side that can be yanked by chains as the coffin is lowered into the grave. This will allow the scumbag dirt to explore for eats
Note #2 Double the grave's depth to 12 feet deep to safeguard against the condemned clawing his way up and out of his execution.

Why do you want to mess up some poor little Island. They should go to the Artic and try it on the Polar Bears. They get wery hungry and need fresh food late in the summer.

Imagine a world where only collective identity, power and what you feel is real. Neither logic nor truth has a place in such a clown world.