A man holds his snorkelling gear on the sunset near the Black Sea village of Molochnoye, Crimea July 23, 2020. Picture taken July 23, 2020. REUTERS/Alexey Pavlishak

Volunteer dentists convert snorkel masks into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

A view shows snorkel masks to be converted into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

Volunteer dentists assemble snorkel masks and convert them into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

Volunteer dentists assemble snorkel masks and convert them into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

A volunteer dentist works on converting a snorkel mask into a respirator, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

A worker prepares the fittings for an HMEF viral filter to be added to a full-face snorkel mask developed by MasksOn.org, a non-profit organization donating snorkel masks that have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Roy adds the fitting for an HMEF viral filter to a full-face snorkel mask while assembling the face masks developed by MasksOn.org, a non-profit organization donating snorkel masks that have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Rousseau, Head of Engineering, models a mask developed by MasksOn.org, a non-profit organization donating full-face snorkel masks which have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Roy adds the fitting for an HMEF viral filter to a full-face snorkel mask while assembling the face masks developed by MasksOn.org, a non-profit organization donating snorkel masks that have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

Dane Kouttron, a co-developer at MasksOn.org and a Nuclear Research Engineer at MIT, holds a mask developed by MasksOn.org, a non-profit organization donating full-face snorkel masks which have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Rousseau, Head of Engineering, models a mask developed by MasksOn.org, a non-profit organization donating full-face snorkel masks which have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Rousseau, Head of Engineering, holds the fitting and HMEF viral filter to be added to a full-face snorkel mask developed by MasksOn.org, a non-profit organization donating snorkel masks which have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Roy adds a fitting for an HMEF viral filter to a full-face snorkel mask while assembling the face masks developed by MasksOn.org, a non-profit organization donating snorkel masks that have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Rousseau, Head of Engineering, models a mask developed by MasksOn.org, a non-profit organization donating full-face snorkel masks which have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

Dane Kouttron, a co-developer at MasksOn.org and a Nuclear Research Engineer at MIT, holds a full-face snorkel mask with an HMEF viral filter developed by MasksOn.org, a non-profit organization donating full-face snorkel masks which have been retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

John Roy assembles face masks developed by MasksOn.org, a non-profit organization donating full-face snorkel masks retrofitted into reusable, sanitizable emergency face masks to protect front-line healthcare workers amid the coronavirus disease (COVID-19) outbreak, in Haverhill, Massachusetts, U.S., April 16, 2020. REUTERS/Brian Snyder

A patient suffering from coronavirus disease (COVID-19) wears a full-face Easybreath snorkelling mask given by sport chain Decathlon and turned into a ventilator for coronavirus treatment at the intensive care unit at Ambroise Pare clinic in Neuilly-sur-Seine near Paris, as the spread of the coronavirus disease continues in France, April 1, 2020. REUTERS/Benoit Tessier

A patient suffering from coronavirus disease (COVID-19) wears a full-face Easybreath snorkelling mask given by sport chain Decathlon and turned into a ventilator for coronavirus treatment at the intensive care unit at Ambroise Pare clinic in Neuilly-sur-Seine near Paris, as the spread of the coronavirus disease continues in France, April 1, 2020. REUTERS/Benoit Tessier

A patient suffering from coronavirus disease (COVID-19) wears a full-face Easybreath snorkelling mask given by sport chain Decathlon and turned into a ventilator for coronavirus treatment at the intensive care unit at Ambroise Pare clinic in Neuilly-sur-Seine near Paris, as the spread of the coronavirus disease continues in France, April 1, 2020. REUTERS/Benoit Tessier TPX IMAGES OF THE DAY

A patient suffering from coronavirus disease (COVID-19) wears a full-face Easybreath snorkelling mask given by sport chain Decathlon and turned into a ventilator for coronavirus treatment at the intensive care unit at Ambroise Pare clinic in Neuilly-sur-Seine near Paris, as the spread of the coronavirus disease continues in France, April 1, 2020. REUTERS/Benoit Tessier

A medical staff holds a full-face Easybreath snorkelling mask given by sport chain Decathlon and turned into a ventilator for coronavirus treatment at the intensive care unit at Ambroise Pare clinic in Neuilly-sur-Seine near Paris, as the spread of the coronavirus disease (COVID-19) continues in France, April 1, 2020. REUTERS/Benoit Tessier

A patient suffering from coronavirus disease (COVID-19) wears a full-face Easybreath snorkelling mask given by sport chain Decathlon and turned into a ventilator for coronavirus treatment at the intensive care unit at Ambroise Pare clinic in Neuilly-sur-Seine near Paris, as the spread of the coronavirus disease continues in France, April 1, 2020. REUTERS/Benoit Tessier

A volunteer assembles a snorkel mask transformed into high-grade protection for medical workers facing the coronavirus disease (COVID-19) outbreak at the Czech Institute of Informatics, Robotics and Cybernetics at Czech Technical University in Prague, Czech Republic, March 30, 2020. REUTERS/David W Cerny

A volunteer assembles a snorkel mask transformed into high-grade protection for medical workers facing the coronavirus disease (COVID-19) outbreak at the Czech Institute of Informatics, Robotics and Cybernetics at Czech Technical University in Prague, Czech Republic, March 30, 2020. REUTERS/David W Cerny

A snorkel mask transformed into high-grade protection for medical workers facing the coronavirus disease (COVID-19) outbreak is seen at the Czech Institute of Informatics, Robotics and Cybernetics at Czech Technical University in Prague, Czech Republic, March 30, 2020. REUTERS/David W Cerny

A researcher assembles a snorkel mask transformed into high-grade protection for medical workers facing the coronavirus disease (COVID-19) outbreak at the Czech Institute of Informatics, Robotics and Cybernetics at Czech Technical University in Prague, Czech Republic, March 30, 2020. REUTERS/David W Cerny

Volunteers assemble snorkel masks transformed into high-grade protection for medical workers facing the coronavirus disease (COVID-19) outbreak at the Czech Institute of Informatics, Robotics and Cybernetics at Czech Technical University in Prague, Czech Republic, March 30, 2020. REUTERS/David W Cerny

A researcher holds a snorkel mask transformed into high-grade protection for medical workers facing the coronavirus disease (COVID-19) outbreak at the Czech Institute of Informatics, Robotics and Cybernetics at Czech Technical University in Prague, Czech Republic, March 30, 2020. REUTERS/David W Cerny

A nurse wears a full-face snorkelling mask, as part of a donation of 50 snorkeling masks by sports chain Decathlon, transformed as respirators to help treat coronavirus disease (COVID-19) patients at the Erasme (Erasmus) Hospital in Brussels, Belgium March 30, 2020. REUTERS/Yves Herman

A nurse wears a full-face snorkelling mask, as part of a donation of 50 snorkeling masks by sports chain Decathlon, transformed as respirators to help treat coronavirus disease (COVID-19) patients at the Erasme (Erasmus) Hospital in Brussels, Belgium March 30, 2020. REUTERS/Yves Herman

A nurse wears a full-face snorkelling mask, as part of a donation of 50 snorkeling masks by sports chain Decathlon, transformed as respirators to help treat coronavirus disease (COVID-19) patients at the Erasme (Erasmus) Hospital in Brussels, Belgium March 30, 2020. REUTERS/Yves Herman

A nurse wears a full-face snorkelling mask, as part of a donation of 50 snorkeling masks by sports chain Decathlon, transformed as respirators to help treat coronavirus disease (COVID-19) patients at the Erasme (Erasmus) Hospital in Brussels, Belgium March 30, 2020. REUTERS/Yves Herman

A nurse wears a full-face snorkelling mask, as part of a donation of 50 snorkeling masks by sports chain Decathlon, transformed as respirators to help treat coronavirus disease (COVID-19) patients at the Erasme (Erasmus) Hospital in Brussels, Belgium March 30, 2020. REUTERS/Yves Herman

A nurse wears a full-face snorkelling mask, as part of a donation of 50 snorkeling masks by sports chain Decathlon, transformed as respirators to help treat coronavirus disease (COVID-19) patients at the Erasme (Erasmus) Hospital in Brussels, Belgium March 30, 2020. REUTERS/Yves Herman

A tourist snorkels near a beach of the Red Sea resort of Sahl Hasheesh, Hurghada, Egypt, January 8, 2020. Picture taken January 8, 2020. REUTERS/Amr Abdallah Dalsh

Tourists warm themselves after snorkeling near a beach of the Red Sea resort of Sahl Hasheesh, Hurghada, Egypt January 8, 2020. Picture taken January 8, 2020. REUTERS/Amr Abdallah Dalsh

Tourists snorkel near a beach of the Red Sea resort of Sahl Hasheesh, Hurghada, Egypt January 8, 2020. Picture taken January 8, 2020. REUTERS/Amr Abdallah Dalsh

Graduate student Naomi Huntley snorkels after a dive to inspect corals affected by Stony Coral Tissue Loss Disease (SCTLD) near the University of the Virgin Islands campus in St Thomas in the U.S. Virgin Islands, May 17, 2019. REUTERS/Lucas Jackson

Competitors in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

Competitors wear fancy dress in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

Competitors wear fancy hats in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

Medals that will be presented to contestants in the World Bog Snorkelling Championships are pictured in Llanwrtyd Wells, Powys, Wales, Britain. August 25, 2019. REUTERS/Rebecca Naden

Medals that will be presented to contestants in the World Bog Snorkelling Championships are pictured in Llanwrtyd Wells, Powys, Wales, Britain. August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain August 25, 2019. REUTERS/Rebecca Naden TPX IMAGES OF THE DAY

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain. August 25, 2019. REUTERS/Rebecca Naden

A competitor swims in the World Bog Snorkelling Championships, Llanwrtyd Wells, Powys, Wales, Britain. August 25, 2019. REUTERS/Rebecca Naden

A Saudi female diver wearing an abaya carries snorkels as she makes her way to swim in Half Moon Beach open-water dive site in Dhahran, Saudi Arabia, September 15, 2018. Picture taken September 15, 2018. REUTERS/Hamad I Mohammed

A competitor takes part in the World Bog Snorkelling Championships in Waen Rhydd peat bog at Llanwrtyd Wells in Wales, Britain August 26, 2018. REUTERS/Rebecca Naden TPX IMAGES OF THE DAY

Children shelter from the rain during the World Bog Snorkelling Championships in Waen Rhydd peat bog at Llanwrtyd Wells in Wales, Britain August 26, 2018. REUTERS/Rebecca Naden

A competitor (L) waits to take part in the World Bog Snorkelling Championships in Waen Rhydd peat bog at Llanwrtyd Wells in Wales, Britain August 26, 2018. REUTERS/Rebecca Naden

A competitor takes part in the World Bog Snorkelling Championships in Waen Rhydd peat bog at Llanwrtyd Wells in Wales, Britain August 26, 2018. REUTERS/Rebecca Naden