Firefighters install a mobile inflatable barrier against floods on the Schwanenplatz square in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

Frefighters' installed a mobile inflatable barrier against floods on the Schwanenplatz square in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

People walk past as firefighters prepare a mobile inflatable barrier against floods on the Schwanenplatz square in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

Firefighters and civil protection workers carry sandbags to a mobile flood barrier along the Reuss River in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

People walk past as firefighters prepare a mobile inflatable barrier against floods on the Schwanenplatz square in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

Frefighters prepare a mobile inflatable barrier against floods against floods on the Schwanenplatz square in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

People walk past a mobile inflatable barrier against floods of the Reuss River in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

A flooded ticket counter for boat excursions is seen on the banks of lake Lucerne in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

A flooded lookout is seen on the banks of lake Lucerne in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

A mobile flood barrier is seen along the Reuss River in front of the Kapellbruecke bridge in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

Firefighters stand behind a mobile flood barrier along the Reuss River in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

People look at the high water levels of the Reuss River in front of the Kapellbruecke bridge and the oldtown in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

A firefighter places a sandbag behind a mobile flood barrier along the Reuss River in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

A man walks past a flooded lookout on the banks of lake Lucerne in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

A firefighter places a sandbag behind a mobile flood barrier along the Reuss River in Luzern, Switzerland July 15, 2021. REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Denmark's Fie Udby Erichsen awaits the start during Heat 2 of the Women's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Denmark's Hedvig Laerke Berg Rasmussen awaits the start during Heat 2 of the Women's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Czech Republic's Jan Cincibuch awaits the start during Heat 1 of the Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Denmark's Joachim Sutton awaits the start during Heat 1 of the Men's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Denmark's Joachim Sutton and Frederik Vystavel in action during Heat 3 of the Men's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Denmark's Frederik Vystavel awaits the start during Heat 1 of the Men's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Netherlands' Gullaume Krommenhoek awaits the start during Heat 3 of the Men's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Denmark's Hedvig Laerke Berg Rasmussen and Fie Udby erichsen in action during Heat 2 of the Women's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Netherlands' Nicolas van Sprang awaits the start during Heat 3 of the Men's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Czech Republic's Jakub Podrazil awaits the start during Heat 1 of the Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Ireland's Emily Hegarty awaits the start during Heat 1 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Ireland's Fiona Murtagh awaits the start during Heat 1 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Russia's Ilya Kondratyev awaits the start during Heat 2 of the Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Russia's Andrey Potapkin awaits the start during Heat 2 of the Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Ireland's Aifric Keogh awaits the start during Heat 1 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Netherlands' Nicolas van Sprang and Gullaume Krommenhoek in action during Heat 3 of the Men's Pair REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Czech Republic's Jakub Podrazil and Jan Cincibuch in action during Heat 1 of the Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Russia's Ilya Kondratyev and Andrey Potapkin in action during Heat 2 of the Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 China's Fei Wang awaits the start during Heat 2 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Canada's Gavin Stone awaits the start during Heat 2 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 China's Xinyu Lin awaits the start during Heat 2 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Canada's William Peter Simpson Crothers awaits the start during Heat 2 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Ireland's Aifric Keogh, Eimear Lambe, Fiona Murtagh and Emily Hegarty in action during Heat 1 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 China's Miaommiao Qin awaits the start during Heat 2 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 China's Shiyu Lu awaits the start during Heat of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Canada's Luke Gadson awaits the start during Heat 2 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 China's Miaommiao Qin, Shiyu Lu, Xinyu Lin and Fei Wang in action during Heat 2 of the Women's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 South Africa's Kyle Schoonbee awaits the start during Heat 3 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Canada's Jakub Buczek awaits the start during Heat 2 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 South Africa's Sandro Paulo awaits the start during Heat 3 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 South Africa's John Smith awaits the start during Heat 3 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Greece's Anneta Kyridou awaits the start during Heat 2 of the Women's Single Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Canada's Jakub Buczek, Luke Gadson, Gavin Stone and William Peter Simpson Crothers during Heat 2 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 South Africa's Lawrence Brittain awaits the start during Heat 3 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Belarus' Tatsiana Klimovich awaits the start during Heat 2 of the Women's Single Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Greece's Anneta Kyridou in action during Heat 2 of the Women's Single Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 South Africa's Lawrence Brittain, Kyle Schonbee, John Smith and Sandro Paulo in action during Heat 3 of the Men's Four REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Michelle Sechser of the U.S. awaits the start during the Heat 2 of the Lightweight Women's Double Skulls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Switzerland's Patricia Merz and Frederique Rol in action during the Heat 3 of the Lightweight Women's Double Skulls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Canada's Trevor Jones awaits the start during Heat 3 of the Men's Single Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Switzerland's Frederique Rol awaits the start during the Heat 3 of the Lightweight Women's Double Skulls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Belarus' Tatsiana Klimovich in actiont during Heat 2 of the Women's Single Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Russia's Alexander Vyazovkin in action during Heat 1 of the Men's Single Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Czech Republic's Miroslav Vrastil awaits the start during Heat 1 of the Lightweight Men's Double Sculls REUTERS/Arnd Wiegmann

Rowing - FISA Final Olympic Qualification Regatta - Lucerne, Switzerland - May 15, 2021 Switzerland's Patricia Merz awaits the start during the Heat 3 of the Lightweight Women's Double Skulls REUTERS/Arnd Wiegmann