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How or why have people died there?
A variety of reasons.
Some newly minted DM's like to do it as a rite of passage. Through the arch at 55m on a Single Ali 11 (80cuft).
Some tech divers don't realise where the arch actually is and go deeper searching for it. Hint: from the walkway head to the left hand side, not the right!
One instructor started picking up weight belts at the bottom and couldn't make it back to the surface.
As a tech dive it is a really easy dive. Anyone who's had decent ​tech training shouldn't have any problem diving the arch.