Wild abalone stocks are extinct in some parts of the world and the South Australian Coast is one of the final frontiers. Protecting this prized delicacy is key.

Rookie divers are chomping at the bit to prove themselves but the seasoned pros aren't about to hand over their pay packet to any young kid hungry to leave his mark.

Rookie crew and the veterans are desperate to get their catch rates back on track but the best laid plans go awry.

Winter storms strike the coast, wreaking havoc on the catch rate.

Abalone divers are forced to brave more dangerous conditions despite increased numbers of great white sightings along the coast; one team tries their luck close to a sea lion colony in notorious shark-infested waters.

Everyone in the Port Lincoln abalone industry is on edge, as roaming great white sharks fleeing an orca attack could appear anywhere at any time; one diver elects to dive deep in an effort to avoid the marauding pointers.

The divers' lives are thrust into further peril when a rare orca attack on a great white shark sends the Neptune Island sharks fleeing to roam the waters of the prime abalone beds.

To complete their multi-million dollar quotas, Jay and Skin focus on secret abalone bed just 10kms out of Port Lincoln with the 60 day deadline hanging over their heads.

In the world of the professional abalone diver, it's an unceasing battle with the elements; as the winter cease fire ends, the spring offensive begins.

An abalone diver is attacked by a shark; Skin and Jay step up safety measures; Bucky faces bankruptcy.

Winter storms are set to rage up from the Southern Ocean with the potential to halt all abalone diving for weeks; with only limited dive days per year, crews risk it all to find innovative ways to keep the abalone coming in.

It's midway through the season and the crews now have to motor out further, dive deeper and push the limits to fulfill orders for their quota owners.

The crews, including a new team, launch into treacherous ocean conditions and the relentless threat of shark attacks that plague their every dive.

The abalone game has always been a man's world, but Nicole and Amanda Bichard are ready to change that.

Winter winds and storm waves have battered the South Australian coast for weeks, forcing frustrated abalone divers to wait out the weather in the mundane world of home chores, hobbies, footy, music and the pub.

The stage is set for the $35 million South Australian abalone season; two-person crews set out from Port Lincoln, facing treacherous ocean conditions, unpredictable weather and the growing risk of shark attacks.

"I have no problem sacrificing myself for someone else. It's my job." So says a member of the elite Combat Rescue unit of the U.S. Air Force, whose job it is to come to the aid of American or Allied forces who are either injured or are in extreme danger. "Inside Combat Rescue," the result of unprecedented access provided to National Geographic Channel, takes viewers inside the harrowing world of the brave airmen -- Pararescuemen or PJs, as they're known -- during a four-month deployment to Kandahar, Afghanistan. More than two dozen missions are chronicled in the series, using strategically placed cameras on airmen's helmets and more than 40 cameras mounted both inside and outside of the Air Force's Pave Hawk helicopters. PJs and their rescue teammates race against time to save Americans, coalition forces, Afghan allies and even local Afghan families caught in the crossfire within the "golden hour," the critical first hour that's often the difference between life and death.

World famous adventurer and survival expert Bear Grylls reveals the true stories of ordinary people who found themselves in extraordinary life or death situations. Bear ventures into jungles, snow-capped mountains, burning deserts and steep canyons to replicate the key moments and terrifying realities of the encounters, from bandit attacks and avalanches, to being lost in ferocious sand storms and being confronted with bears. He talks about what the survivors did to help their cause, and demonstrates some of the mistakes they made along the way that nearly cost them their lives.

"Lone Target" puts a new twist on the reality TV survival show genre, pitting former Navy SEAL Joel Lambert against the world's most elite military and law enforcement tracking teams in a real game of cat and mouse. Dropped at a secret starting point in each episode, Lambert gets a small head start to evade capture by a highly specialized military or law enforcement tracking team and reach a designated end point in less than two days. Lambert uses diversionary tactics and survival techniques gained from his 10 years of duty as a Navy SEAL, and he is afforded a basic survival kit and a canteen of water.

How does the drug trade work? Can it be stopped or should it be regulated? And what are the personal costs? Those are just some of the questions asked in this series, a comprehensive look at society's most abused drugs: cocaine, methamphetamine, heroin and marijuana. First-person perspectives from traffickers, dealers, users, law enforcement and medical professionals detail how the drugs are processed and moved onto the streets, and the effects they have on the human body. It's a raw, eye-opening documentary about a billion-dollar industry.

Business news preceding the opening of the markets in Asia.

Before complaining about the market price of Alaska king crab, check out this gripping documentary series, revealing the mortal perils and intense discomfort that fishing crews face on the Bering Sea to catch the delicacy. Those perils include 40-foot waves, 700-pound crab pots that can easily crush a careless crewman, and freezing temperatures around the clock.

Popular Animal Planet personality Jeremy Wade, the nine-season star of the network's top-rated series "River Monsters," returns to waterways across the globe to investigate reports of the unimaginable and unexplained. He takes viewers on journeys beneath the water to remote areas, to islands lost in time and out into the open ocean to investigate reports that include entire fish species suddenly disappearing; unexplained sightings of mythical beasts; once thriving rivers now empty; and genetic oddities that may have produced the biggest monsters yet.

Forget everything you thought you knew about science -- "Outrageous Acts of Science" proves that testing the principles of physics, chemistry, biology, and engineering isn't confined to just laboratories anymore. The fast-paced series scours the Web for the best self-appointed scientists whose homegrown research -- mind-boggling experiments, extraordinary inventions and jaw-dropping scientific stunts -- has gone viral. Hourlong episodes count down the best clips, supported by a team of actual scientists who analyze the principles behind the backyard shenanigans.