This diary is written by Ola Melzig, the Technical Director of the contest. Most of the content are photos presenting the crew behind each element of the show, but there are also some images of the arena and the stage itself!
You can check this year's diary at http://www.m-m-pr.com/index.php/eurovision-diary-2016,
or you can see the previous years he worked on the show.
But before you check the diary, take a look at the first glimpse of the 2D cable camera in the arena, in the video below!