By Christopher Clark and Shaun Swingler
Barely a single great white shark has been spotted off the city's coast for two years, where once there were hundreds.
By Helen Briggs
BBC Science correspondent
Steve Backshall discovers why the Bahamas provide ideal sanctuary for sharks. What we can learn from these rich tropical waters that will help oceans all across the planet?
Millions of ridged scales make it difficult for bacteria to attach to the skin of a shark. Can we reduce infections and fight superbugs in a similar way? #30Animals
Tests could show if Wales is a hotspot for the critically-endangered species.
Two Grey Nurse sharks were feeding on a large school of salmon while swimmers had a morning dip.
"It's a fish really getting itself into somewhere that it's not designed to be," says rescue team.
By Frances Mao
BBC News, Sydney
Australian surfer Matt Wilkinson was alerted to the shark by lifeguards using a drone.
An officer on board the ship shot at the 8ft-long shark to deter it from attacking the crew members.