People walk past Southwark Underground station that is closed while London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

People walk past closed gates at an entrance to Waterloo Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for taxis outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

A view of closed gates outside Victoria Underground station while people queue for buses, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

A view of closed gates outside Victoria Underground station while people queue for buses, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Two commuters read a sign outside closed gates at Victoria Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

London Underground workers form a picket outside Brixton Underground station while on strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

People walk past closed gates at an entrance to Waterloo Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Two commuters stand outside closed gates at Victoria Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

A person walks past closed gates at Westminster Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

A commuter stands outside closed gates at Victoria Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Commuters queue for buses outside Victoria Underground station, which is closed as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

People walk past closed gates at an entrance to Waterloo Underground station, as London Underground workers strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

London Underground workers form a picket outside Brixton Underground station while on strike over pay and terms, in London, Britain, August 19, 2022. REUTERS/Henry Nicholls 

Girls take part in a dance practice at an underground square between two metro stations, which will be used as an air-raid shelter in the event of an attack, in Taipei, Taiwan July 21, 2022. REUTERS/Ann Wang 

A man gets a haircut at a barber shop in an underground shopping centre between two metro stations, which will be used as an air-raid shelter in the event of an attack, in Taipei, Taiwan July 20, 2022. REUTERS/Ann Wang 

A man walks past a bookstore in an underground shopping centre between two metro stations, which will be used as an air-raid shelter in the event of an attack, in Taipei, Taiwan July 20, 2022. REUTERS/Ann Wang 

A masseur works at a massage parlour in an underground shopping centre between two metro stations, which will be used as an air-raid shelter in the event of an attack, in Taipei, Taiwan July 20, 2022. REUTERS/Ann Wang 

Commuters ride an escalator in an underground metro station, which will be used as an air-raid shelter in the event of an attack, in Taipei, Taiwan July 20, 2022. REUTERS/Ann Wang 

Signs are seen at the entrance to Bond Street underground station on the first day of national rail strike, in London, Britain June 21, 2022. REUTERS/John Sibley 

Union Jack flags and signs are seen outside Oxford Circus underground station on the first day of national rail strike, in London, Britain June 21, 2022. REUTERS/John Sibley 

People walk outside Oxford Circus underground station on the first day of national rail strike, in London, Britain June 21, 2022. REUTERS/John Sibley 

A woman with a luggage walks past a closed entrance to the underground train station on the first day of national rail strike in London, Britain, June 21, 2022. REUTERS/Henry Nicholls

 

People walk past a closed entrance to the underground train station on the first day of national rail strike in London, Britain, June 21, 2022. REUTERS/Henry Nicholls

 

A view of a camera filming at Waterloo Underground Station, on the first day of national rail strike in London, Britain, June 21, 2022. REUTERS/Henry Nicholls 

An informational poster is placed outside Victoria Underground Station during a strike, in London, Britain June 21, 2022. REUTERS/John Sibley 

A passenger walks past a travel information message, ahead of a planned national strike by rail workers, at Westminster underground station, in London, Britain, June 20, 2022. REUTERS/Toby Melville 

Passengers exit the the Elizabeth Line underground station at Paddington, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers disembark an Elizabeth Line train at Canary Wharf underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers ride an escalator at the Canary Wharf Elizabeth Line underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Police officers walk along a platform at the Elizabeth Line underground station on Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Armed police officers stand on a platform at the Elizabeth Line underground station on Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers disembark an Elizabeth Line train at Liverpool Street underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers board an Elizabeth Line train at Liverpool Street underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers wait for an Elizabeth Line train at Liverpool Street underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers disembark an Elizabeth Line train at Liverpool Street underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

Passengers board an Elizabeth Line train at Liverpool Street underground station, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

People travel through the Elizabeth Line underground station at Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

People travel on an escalator at the Elizabeth Line underground station on Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

People walk through the Elizabeth Line underground station at Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

People travel through the Elizabeth Line underground station at Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

People walk through the Elizabeth Line underground station at Liverpool Street, on the day it opens to members of the public for the first time, in London, Britain, May 24, 2022. REUTERS/Henry Nicholls 

People stand in an underground shelter below their apartment block, following a military strike on a facility near the railway station, amid Russia's invasion of Ukraine, in the frontline city of Lyman, Donetsk region, Ukraine April 28, 2022. REUTERS/Jorge Silva 

Katarina Bovt holds son son Nikita in a metro station in northern Kharkiv where they live to shelter from shelling in their neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Bovt has moved to the underground shelter three weeks ago. REUTERS/Thomas Peter 

Natalia Shaposhnik, 36, plays with her daughter Veronika, 7, in a stationary subway car in a metro station in northern Kharkiv where they live to shelter from shelling in their neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Shaposhnik and her daughter moved underground with 30 days ago, on the first day of the war. REUTERS/Thomas Peter 

Veronika Shaposhnik, 7, sits in a stationary subway car in a metro station in northern Kharkiv where she lives with her mother to shelter from shelling in her neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Veronika moved underground with her mother 30 days ago, on the first day of the war. REUTERS/Thomas Peter 

Raisa sits in a stationary subway car in a metro station in northern Kharkiv where she lives to shelter from shelling in her neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Raisa has moved underground 30 days ago on the first day of the war. REUTERS/Thomas Peter 

Lyudmila Lazareva and her dog Rika sit in a in a metro station in northern Kharkiv with Katarina Bovt, Kolya and their son Nikita where they live to shelter from shelling in their neighbourhood, as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Lazareva has moved to the underground shelter 30 days ago after the apartment building next to hers got hit by a shell on the first day of the wa and she only leaves the station to briefly walk her dog. REUTERS/Thomas Peter 

A man speaks from a bible at the underground walking transfer platform from Times Square to the Port Authority station in New York City, U.S., March 22, 2022. REUTERS/Shannon Stapleton 

Egyptian wrestler Ashraf Kabonga celebrates with fans and media after making it to the Guinness World Records by pulling a 180-tonne subway "metro" train at the train workshops in Shubra El-Kheima north of Cairo, Egypt March 3, 2022. Picture taken March 3, 2022. REUTERS/Amr Abdallah Dalsh 

People look on from a subway train as Berlin Mayor Franziska Giffey visits a Berlin subway station during International Women's Day in Berlin, Germany March 8, 2022. REUTERS/Lisi Niesner