This is the Czech version made by Prima Cool. As of this writing, the series is still ongoing.
This is an uncensored version and for me, this has eclipsed Life Stripped Bare of UK's Channel 4 and Spanish Antenna 3's El contenedor in terms of nudity (even though Heidi's naked dash is still the best ENF scene in any adaptations of this format). There were only 4 contestants in this version and 2 of them are women.
https://cool.iprima.cz/experiment-21