Many planes, ships and boats have disappeared in this region. There have been nearly 175 disappearances. No one is certain what causes these ships to disappear. Many have speculated that it is because of sudden weather changes, some say it is alien/UFO related, and some say it is the result of hydrogen released from the bottom of the ocean. Whatever the reason these things do happen. Many times planes have reported their compasses going nuts - instead of point the direction they are flying it simply spins around. This makes some speculate that it is related to a magnetic changes in the region. 

It doesn't disappear it is always there.  It merely requires certain conditions to be met to be active and cause the problems it does.  Why and what causes this?  That is the mystery!