Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, arrive at the their tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, stand on their balconies at the a tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, stand on their balconies at the a tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, arrive at the their tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, arrive at the their tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

General view of a gate to the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

People are seen at a balcony of the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

General view of the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

General view of the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. Picture taken with a drone. REUTERS/Louiza Vradi

Student of the Department of Conservation of Antiquities and Works of Art Eirini Mitsi, 23, works on an amphora retrieved from a shipwreck site on the island of Fournoi, Greece, September 20, 2018. Picture taken September 20, 2018. REUTERS/Alkis Konstantinidis

Student of the Department of Conservation of Antiquities and Works of Art Giorgos Agavanakis, 24, takes pictures as fellow student Eirini Mitsi, 23, takes notes on an amphora retrieved from a shipwreck site on the island of Fournoi, Greece, September 20, 2018. Picture taken September 20, 2018. REUTERS/Alkis Konstantinidis

Students of the Department of Conservation of Antiquities and Works of Art Giorgos Agavanakis, 24, Helen Margarita Bardas, 25, and Eirini Mitsi, 23, work on amphorae retrieved from shipwreck sites on the island of Fournoi, Greece, September 20, 2018. Picture taken September 20, 2018. REUTERS/Alkis Konstantinidis