Ultimate Survival Alaska Season 3 Episode 12 : [*Knockout Punch*] br Airs : Sunday, at 22:00 br Network : National Geographic br Episode Plot: br With just two legs to go, the pressure's on to snag one of the few remaining wins. At the insertion flag, the teams find a cache of inner tubes, planks and ropes to design and build handmade rafts durable enough to survive the roughest whitewater they�€셶e faced yet.