Immunity Challenge tree mail, and it's simple according to Rob: Andrea can't win it!!!!

Rob gives up the Immunity Necklace...

Race to get puzzle steps... and then put them up the gigantic staircase! First to the top and raise their flag, wins Immunity!

A bundle that needs untied first, then put a plank up at a time...

Andrea's at the lead after the first group of puzzle steps... Grant and Rob are shortly behind... can only carry a plank at a time... if you bring the wrong one up, you have to go all the way back down to correct the mistake...

Grant's done with the 2nd grouping, Rob shortly behind... then Andrea... 110 degrees out there today... Grant's starting to make mistakes... Rob's in a slight lead right now with Grant just behind...

Rob has the last puzzle board, but he's almost out of gas!!! Grant's almost there, but...

ROB WINS IMMUNITY!!!!

Jeff comment during the challenge: "He's literally carrying his family on his back!" Rob's exhausted at the top and is cramping up... Jeff asks if he needs Medical, but Rob asks if he can get help standing up... and after a little rest, he gets the Immunity Necklace... hobbling a little but he does so.