Michael Mosley latest - the 6 theories police are investigating amid growing fears for missing TV star

Dr Michael Mosley, 67, has now been missing for two days on the Greek island of Symi, where he was holidaying with his GP wife Dr Clare Bailey. Police launched a massive search operation with holidaymakers and the local island community pitching in, and it's believed there are now several theories being considered.

According to reports, Greek officials have now set a deadline due to fears that the intense summer heat may have affected the This Morning doctor. However, this isn't the only theory officials are exploring, with other suggestions including a fall from a height or even a snake bite.

Earlier today (Friday 7 June) the local police resumed their search of the island after pausing overnight, and were using drones to try and locate the missing Briton. Divers were also sent out to look "in the water" and the local coastguard joined in the search and rescue efforts. Here's a round-up of the theories being considered at the moment:

Falling from a height.

Initially, Greek police thought that Michael might have "fallen from a height" during his walk along St Nicholas Beach, which is in the north west of the island. The island's mayor, Eleftherios Papakalodoukas, pointed out the dangerous nature of the doctor's alleged chosen hiking route, which features "very high cliffs" and rocky terrain, posed significant risks.

Symi Island is known for its mountainous landscape, with its coastline alternating between rocky cliffs, beaches and secluded coves. Some beaches can only be reached by boat, reports the Express.

Falling into the sea.

Another theory is that the dad of four might have fallen into the sea. Symi's Deputy Mayor Ilias Chaskas confirmed to the PA news agency that “divers are looking in the water”, and the local coast guard have joined the search.

The Symi coast guard said: “All our patrol boats are searching … about five and also all the private boats, commercial boats know about the incident and they look for (him) also, in this area, (so this is) the private, the commercial and the patrol (boats looking).”

Fainting in the high heat

The Mayor, Papakalodoukas, speculated that the high temperatures may have triggered dehydration in the doctor. He informed reporters that without adequate hydration, the likelihood of fainting under challenging conditions would have been significantly higher.

Michael, who hosts Trust Me, I'm A Doctor, set out for his walk at 1.30pm on Wednesday 5 June, when the island's temperature peaked at around 35C due to an ongoing heatwave.

Bitten by a snake

Another possibility that hasn't been dismissed is that Dr Mosley was bitten by a snake. Although rare, Symi is known to be home to the Ottoman Viper - Europe's most venomous snake. While there isn't much information about the venom composition and lethality of the Ottoman Viper, similar species are known to have mainly cytotoxic (harmful to cells) and haemotoxic (destroys red blood cells and disrupts clotting) components. Even a small amount of this venom is highly potent and has been known to cause fatalities in adults.

Becoming lost

The TV doctor and diet guru didn't take his phone with him on his walk, raising the possibility that he may have gotten lost. A woman reported seeing him in the Pedi area of the island on the day he went missing, but the Mayor said firefighters had told him they believed it was "impossible" that he was still there.

He told the BBC: “It is a very small, controlled area, full of people. So if something happened to him there, we would have found him by now.” According to the PA news agency, a local woman said the disappearance was "strange" as the path he was belived to have taken on his walk was "clear". She said: “It’s a quiet place … if you see the map of the area it’s a clear path, it’s nothing dangerous, many people go every day, every few minutes, that’s the reason it’s very strange because it’s a clear path.”

Sustaining an injury

With Michael without his phone, concerns have been raised about his ability to contact someone for help should he have sustained an injury. A senior Greek official overseeing the search efforts has assured that every effort is being made to locate the beloved star. Speaking to The Sun, they said: "Since this morning we have had all available forces out there on the island and we have asked to bring in specially trained dogs and even a helicopter from Athens for back up too."

They firmly stated, "No stone will be left unturned. Symi is a small island, he can't just have disappeared."