Hmm the first 2 images aren't displaying for me.

I agree that the first scene with the 7 lined up and tables behind them with blocks looks like that challenge from San Juan del Sur where you have to stack the blocks on a table that tilts and you have a rope attached to the table that you hold as you move back and forth. That looks like the Reward challenge.

All the other scenes appear to be the Immunity Challenge. You can also see a colored cloth in Spencer's left hand as well as Kimmi's right hand so I assume it is probably a key to unlock a box of puzzle pieces on shore.

Not sure how much swimming there is in this challenge but there is that one part where they are seen swimming.

Spencer was an awesome swimmer/diver in Cagayan where he had to swim out FOUR times and dive down because J'Tia, Kass, and Tasha all failed to retrieve and buoys below the first one which Tasha had to get after J'Tia failed. Tasha failed to get her next buoy so after that Spencer did them all!

There were not a lot of challenges involving swimming in San Juan del Sur and the one that did both Kelley and Jeremy sat out so not sure how well they swim.

Keith is a very good swimmer. I think he was on a swim team in High School or College.

Abi is dead last in this challenge so I doubt it matters how well she swims.

Kimmi seemed okay at swimming in the Outback but that was so many years ago.

Would Kelley and Spencer work together on an Immunity Challenge puzzle? Maybe the camera angle makes it look like they are closer than they really are.

Will someone go back to rescue Tasha or will they stay in the challenge and let production safety divers rescue Tasha?