Thirsty Gods -Mission Of San Juan Challenge Tomb Walkthrough. Exit to the south and climb onto the ledge to the right of the slippery slope. Swim back up for air if necessary. Climb to the top and crawl into the small opening. Just watch out for another spike pit ahead. Then scramble up the wall to grab onto the closed door and use it to climb onto the ledge above. NOTE: There are five crypts in Paititi. for (i=0;i