Forbidden Desert: Valid Navigator and Climber combo to save two buried players for one action?
I don't have my game/rules with me, but I don't think that is a legal combination. 

My understanding is that the Climber can take someone with him, but that someone would have to go with him for his entire move (on that particular action). So he would not be able to pick up another player in the middle of his movement. 

If the Climber were using his own actions, each tile is a new action so he can pick up or drop off as he chooses. but if using a single action given by the Navigator, I think all three tiles would have to include the same set of player tokens.

This is the way I have played. I'll have to double check my rules to see if there is any clarification.

(And I assume this is your question on boardgamegeek).