A 74-year-old Dutch holidaymaker who had been missing for almost a week on the island of Samos was found dead at the bottom of a gorge on Saturday, Greek media reported.

According to the man’s wife, he had just a small bottle of water with him as he set out on what the locals called a “challenging” three-hour hike from Agios Panteleimonas beach to Agia Kyriaki, in the southwest of the island, on Sunday. Temperatures on the Greek islands have been soaring to over 40°.

A rescue team from the Netherlands including a search dog had just arrived on the island when the news came the man had been located by local police using a drone.

An investigation into the cause of death is still ongoing.

The news comes in the wake of the death of 67-year-old doctor and television presenter Michael Mosley on the island of Symi. It is thought Mosley took a wrong turn when making his way from the beach to the house where he was staying and was overcome by the heat.

Other possible casualties of the heat include an 80-year-old Belgian tourist who was found dead near an archeological site on Crete on Thursday and an American tourist whose body was found on the beach of the small Greek island of Mathraki on Sunday.

Another American tourist was reported missing on the Cycladic island of Amorgos, after setting off alone on a four-hour walk from which he did not return earlier this week. On Friday, two French women aged 63 and 73 respectively, were reported missing on Sikinos.

Local Greek authorities have urged tourists not to underestimate the heat and to not hike in high temperatures.