Recently saw all 6 seasons of Bear GryIls
THE ISLAND - where he strands ~12 British people on an island for 30+ days. They are only provided two 5-gal canisters of water, some fishhooks, and some machetes and they have ~2 in the group that are assigned to film everything. No production staff. No challenges. No rewards. No tribal councils....no vote offs. I found it interesting in a "Social experiment sort of way" in that each season, the group dynamics are different (group of all men, all women, mixed men/women, high paying jobbers vs day labor wagers)
You can find the 1st 4 seasons are on Amazon Prime........Season 5 and 6 i had to watch online.
The sixth series, now renamed
Treasure Island with Bear Grylls, started airing on 8 Sept 2019. This series is the first to involve cash prizes but dropped from air to the island for the participants to find.
[actually, i didn't like this season as much due to the manipulation factor
I remember seeing that series.
Also just finished the Fiji Eco-Challenge series as well.