The picture is not an underexposed image. This is an actual photo during the totality of the July 22 total solar eclipse. The UP Astronomical Society sent a team to China to obeserve the event, and the orbservation was held on the coastal district of Jinshanwei, about 100 km from Shanghai.
Aside from the darkness there was a noticeable drop in temperature as the sun was covered by the moon. The totality occured 9:43 local time, and it lasted for 5'58".