BRITISH TV doctor Michael Mosley vanished on Wednesday while holidaying on the tiny Greek holiday island of Symi.
A major search and rescue operation is underway to locate the 67-year-old presenter as his family vow they will "not lose hope".
At least a hundred cops, firefighters and volunteers are combing over mountainous terrain as they attempt to trace Mosley's final movements.
The mystery behind the BBC presenter's disappearance has continued to deepen after CCTV footage emerged of him walking quickly out of a village towards the rocky hills on Wednesday.
Cops revealed it helped to rule out the possibility the doctor had fallen into the water and shifted the search focus to a far wider and more dangerous 7km area.
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Four gruelling days into the search, Symi's mayor questioned how anyone could survive in the scorching heat that has enveloped the island.
Dr Claire Bailey Mosley, who has now been joined by her four children, said today that the days since her husband went missing have been the "longest and most unbearable".
No trace of her husband has yet been found. A baffled rescuer today remarked "this is a small island...people just don't disappear."
Here The Sun examines the key moments in Dr Michael Mosley's disappearance...
Wednesday 1.30pm: Mosley decides to walk back alone from Saint Nikolas beach where he had been with his wife and two friends to his holiday home in the town of Symi.
Wednesday 1.52pm: CCTV catches Mosley walking past the Blue Corner cafe in Pedi shielded under an umbrella.
Wednesday 2pm: CCTV footage shows the BBC star leaving Pedi and headed towards a rocky, hilly path in the island's northeast - the last-known sighting of Mosley.
Wednesday 3pm: Mosley fails to return from his 20-minute walk despite temperatures soaring to 40C. His phone was left behind at his accommodation.
Wednesday 7.30pm: Mosley's Wife, Dr Clare Bailey, raises the alarm after her husband fails to return.
Wednesday night: Authorities begin to trace Mosley's steps home but are unable to find him.
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Thursday 10.30am: Police file a missing persons report and search begins.
Thursday 11am: A desperate appeal is posted on Symi's Facebook group asking locals if they have seen him.
Thursday 12pm: Cops scour the coast for any signs of Mosley as they probe the idea he may have "fallen from a height" on the short hike home from the beach.
Thursday 2pm: Firefighters arrive to help with the search and CCTV begins to be reviewed.
Thursday 3-7pm: Volunteers, police dogs, drones join in the operation.
Thursday 7pm: A helicopter is deployed to conduct an aerial search.
Thursday night: Search operation paused for the evening with the promise of "more men" arriving on Friday.
Friday morning: Search resumes with extra police, divers, coast guards, patrol boats, drones and choppers and temperatures of up to 48C expected.
Sources say that Mosley told pals he was not feeling well before he left to return home alone.
Friday 5pm: First set of CCTV images released of Mosley walking in Pedi under an umbrella near Blue Corner cafe.
Friday evening: Mosley's four adult children, Alexander, Jack, Daniel and Katherine, arrive on Symi to assist with the search.
Friday night: Investigation takes new twist as cops shift focus to new search area after fears he may have taken three-hour trek up mountain path.
Saturday 6am: Police expand search across wider 7km rocky area as Symi's mayor admits the authorities had been looking in wrong area.
Saturday 7am: Search teams and Mayor Papakalodoukas both tell The Sun the route is incredibly “dangerous” and “treacherous” with no shade.
The mayor added that no one "can survive in this weather".
Saturday 10.50am: New CCTV is released showing Mosley's last-known sighting as he leaves Pedi and heads towards the mountainous path.
Saturday 11am: Mayor Papakalodoukas declared there is "no chance" the search will be called off until he is found.
Saturday 12pm: Mosley's wife Clare says the family will "not lose hope" but confesses the last few days have been "unbearable".
Saturday 3pm: A helicopter flies over Pedi bay towards the mountainous terrain where the hunt for Mosley continues.
