A sulphur lake is pictured in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. The depression lies 100 metres below sea level and is one of the hottest and most inhospitable places on Earth. Despite the gruelling conditions, Ethiopians continue a centuries old industry of mining salt from the ground by hand in temperatures that average 34.5 degrees centigrade but have risen to over 50 degrees. (Photo by Carl Court/Getty Images)





A sulphur spring is pictured in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A sulphur spring is pictured in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A salt miner works in the heat as he digs out salt blocks by hand in the Danakil Depression on January 22, 2017 in Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A sulphur lake is pictured in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A tourist take a photograph of a sulphur lake in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





Camels are loaded with salt blocks mined by hand in the Danakil Depression on January 22, 2017 in Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A camel caravan carrying salt mined by hand is led across a salt plain in the Danakil Depression on January 22, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





An Ethiopian soldier looks on from a hilltop next to a sulphur lake in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A sulphur lake is pictured in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A salt-covered branch lies on a salt plain in the Danakil Depression on January 22, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A salt miner works in the heat as he digs out salt blocks by hand in the Danakil Depression on January 22, 2017 in Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





Part of a sulphur spring is pictured in the Danakil Depression on January 23, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)





A camel caravan carrying salt mined by hand is led across a salt plain in the Danakil Depression on January 22, 2017 near Dallol, Ethiopia. (Photo by Carl Court/Getty Images)