'The Auschwitz Escape' is due to be released on a streaming service soon (it might have already been so) but I bought the dvd and managed to watch it.
It tells the 1944 true story of Rudolf Vrba and Alfred Wetzler who were Slovak prisoners in Auschwitz-Birkenau. Employed as prisoner-scribes they had access to details of the numbers of people arriving and being gassed in the camp. During the building of an extension to Birkenau, the section that would be known as Mexico, they hatched a plan to hide and then escape to get news and proof to the Allies about what was going on in the extermination center.

The part of the film revolving around the day to day life in the camp, the first part of the escape plan and the repercussions for their fellow prisoners makes for tense viewing while the part that deals with them being on the run and eventually meeting an official of the Red Cross to hand over the information is ok but doesn't really get across a sense of just how tense it must of been. It isn't as full on as Son of Saul but does show the barbaric nature of the prisoners treatment and is worth a watch.

For anyone interested, An American translation of The Auschwitz Protocols, which was the report from Vrba & Wetzler, can be seen and downloaded here:
US WRB German Extermination Camps Auschwitz And Birkenau : United States War Refugee Board : Free Download, Borrow, and Streaming : Internet Archive

New Film: The Auschwitz Escape