The Endurance team has a leg up as the squads race 30 miles across a menacing glacier, plunge down a 2,000-foot gully and battle 15 miles of whitewater rapids to the extraction point in Berners Bay.

And the teams are off to Chichagof Island, home to more brown bears per square mile than any other place on earth, but while the Endurance team heads for higher ground, the Moutaineers head right for trouble when their boat capsizes in rough waters. Written by Anonymous

Mission: Bushwhack through 45mi. of dense forest at Tongass National Forest, plunge down 70' waterfalls and battle the violent waters at Steven's Passage. Eager to lead, the Endurance team takes a shortcut, quickly learning that it comes at a cost. Written by Anonymous

The 30mi. trek up and over the snow-covered Tordrillo Mountains proves difficult for all teams. While the Mountaineers rely on their rock-climbing skills, the Military team keeps to lower heights, ultimately staring a huge canyon square in the face. Written by Anonymous

The teams will navigate 50mi. of raging rivers, battle a lethal stretch of whitewater rapids known as Hell's Gate, and bushwhack through thick brush to reach the extraction point.

The teams will traverse the treacherous Hayes Glacier, then bushwhack through dense forest on their way to the extraction zone 30 miles away. The Mountaineers charge through a glacial canyon and hit what might be a dead end, but expert ice climber Tyler isn't daunted by the 80-foot ice wall. The Endurance team gets a shock when their strategy leads them right to a dangerous 200-­foot rappel. Military is making great time until a wrong step drops Grady into the depths of a deadly crevasse. Written by Nat Geo

The teams cross a steep ridge to the crumbling Strandline Canyon, then trek 40 miles to the landing zone. On the way, two teams' strategies land them knee-deep in quicksand, while the other team comes face-to-face with a furious river.

With seven legs of the competition under their belts, take a look back at the extreme challenges the survivalists have endured and take a peek at the brutal adventures still to come. Get to know the teams again and witness their ups and downs throughout the battle to become Alaska's ultimate survivor. Written by Nat Geo

On the eighth leg of the expedition, the teams will battle through a gauntlet of dense alder thickets, cross the roaring waters of Coal Creek and scale a 600-foot rock fall to reach the extraction zone. To get an early lead and escape the torturous bushwhack, the Mountaineer team's strategy is to immediately cross Coal Creek, despite the risky rushing waters. When they reach the creek, Tyler attempts to walk across, but the powerful rapids sweep him downstream and out of sight. Written by Nat Geo

The teams head out on Afognak Island, which is ruled by Kodiak bears, one of the largest bears on Earth. The teams will cross 31 miles of treacherous, bear-packed wilderness to reach the extraction point at the northernmost tip of the island. All three teams are running into bears at every turn. As the Endurance team stops to fish, Sean is left staring into the jaws of a charging brown bear. Between lost maps and wrong turns, the survivalists are just trying to get out of bear country alive. Written by Nat Geo

After nine grueling legs, the teams enter number ten battered, bruised and worn down. But they're in luck. Leg ten takes the teams to Kodiak Island, a lush temperate rainforest, full of opportunities for hunting and gathering food. The teams know this is their best chance to stock up on protein and increase their strength before the final leg of the race. The Endurance Athletes, coming off a victory, are still in a must-win situation. Like the last leg, they will do anything to reach the end before the other teams. But their speed comes at a price. The Mountaineers and Military team start out with the goal of increasing their food stores, and it's not long before they find their answer. While hiking to the extraction point, they encounter a pair of subsistence hunters who agree to join them in a hunt for black-tailed deer. If successful, this hunt could be just what the teams need to get the edge going into the final leg. But will the time lost hunting be worth the potential reward? Written by Nat Geo

On the final leg, the teams face their toughest challenge yet - a race across an icy glacier, down a whitewater river and across the open ocean to the Mount Augustine volcano. The trek begins high atop the Aleutian Mountains, where the competitors harness up and charge across a crevasse-laden glacier. With all three teams facing daunting obstacles, it's anyone's game going into next week's exciting conclusion. Written by Nat Geo

With the final hours of the competition running off the clock, the three remaining teams risk it all for the glory of being crowned champion. It's a cutthroat battle to the top of Mount Augustine - a 4,000-foot active volcano in the middle of the open ocean. To reach it, the teams race across 35 miles of punishing white water rapids and unforgiving seas. In the end, the first team to reach the summit of the volcano is crowned Ultimate Alaskan Survivors. Written by Nat Geo