Hard Merchandise and Hot Tuna invade a southern fleet of Bluefin tuna fishermen.
(02:55)Could you tell a Venetian from a tourist? Students in Venice are tallying the foot traffic in order to help preserve the city.
(03:08)Adam cleares a massive boulder while dangling from a precarious cliffside.
(03:06)Fresh snowfall on Day 2 keeps Tyler and Austin on edge.
(02:04)Fishin’ Frenzy aims to get on the board with a hook up, but it’s never a catch until the fish is in the boat.
(02:46)A River Untamed.
(01:37)Investigators examine how Andrew survived this crash.
(02:28)Marty and his inexperience take on river currents with deadly consequences.
(02:27)The Southern fleet gives a warm welcome to the Pin Wheel.
(02:50)Tyler Johnson is a civil engineer who spends his free time pushing himself to the limit in the wilderness.
(01:19)First Mate Nick on the Fishin’ Frenzy is one of a kind, but will he be the reason they don’t land a tuna?
(02:05)The lost world webisode from Diving the Labyrinth series on National Geographic Channel
(03:05)Crew member talks about the plane they used to capture monarchs in flight.
(02:18)The Air Force replicates the G forces from the fatal skydiving accident.
(02:46)Brock and Adam drop a huge chunk of rock, but it leaves the cliff face with even more crumbling boulders.
(02:23)Fisherman Tyrell Seavey comes from a family of legendary Alaskan adventurers.
(01:16)The rivalry between Pin Wheel and Hot Tuna continues with more chatter over the radio.
(01:43)A government-run facility provides users with needles and a safe place to shoot-up to prevent the spread of HIV.
(02:57)Great whites go where the meal goes - and today that meal is elephant seal.
(02:32)The run is bottled using a roller coaster assembly line.
(02:50)