Did you ever see the movie Die Hard? If you recall, the final lock of seven for the vault the thieves intended to rob was electromagnetic. What might be inside the earth which is imprisoned there by an electromagnetic lock?
You guessed it - Hades !!!
A similar principle was mentioned in the movie Ghostbusters, in which evil spirits were locked in a trap using electromagnetic forces.
Don't believe in evil spirits and/or Hell? You soon may get a lesson in just how wrong you are.