Trying to get stuff to get 100% completion.  Missed a survival cache in Cenote level.  Time travelled to the temple ruins and tried to make my way through the tunnel to the Warren ( the place where you are attacked by lots of yaaxil). I cannot get through the tunnel, the way is blocked with rubble and debris.  
 

 May have to try another way round.

Yeah, there are quite a few places where the return path is different than the path Lara took during the story. Sometimes new base camps appear. Sometimes she destroys terrain. So I'd recommend checking the quick collectibles guide for the Cenote. I have only a rough recollection of that area since it's been a while since I played, but the quick guides tell you the fastest way to eacj item from the nearest base camp.

https://tombraiders.net/stella/walks/TR11walk/collectibles.html

 

Thanks Stella, I will try to get back to it but feel it may not possible.

 

Your help is greatly appreciated.

 

 

Ok, had another go here and discovered another way through.  Instead of going through the original tunnel, to turn left and there is a drop, where you can jump and hold on with your axe, rappel down and you get into the Wareen, with no Yaaxil! Yay!  Followed the tunnel from here, through the water and found the survival cache.

 

Just  need to complete another two challenges in first two levels and find another survival cache and I should have 100%.  On 98% right now.

 

Thanks for your help. 

Awesome! Good luck.