That familiar message terrified Steven Spielberg, 27 years old at the time, with only one theatrical feature to his name. If one of the production's three animatronic great whites broke down, it could mean another wasted day.

Steven Spielberg famously hasn’t held back from explaining the issues he had filming Jaws, his iconic movie – which turns 50 this year – about a hungry jumbo shark munching its way through the oceans around New England’s fictional Amity Island.