Discovery Channel HD Saturday

Johnathan delegates dentistry duties when his brother's dental implants fail at sea. Rick reverses course after his greenhorn suffers a head injury.

A look at the gravity-defying 'magic' behind Pisa's leaning tower. Plus, the making of chocolate digestive biscuits

How ancient Greeks invented parchment with techniques still used today. Plus, the making of shuttlecocks

How pizza is made for soldiers on the frontline, and the process of making the world's smoothest writing ballpoint pens that don't leak or fade

How to make modern violins that sound as good as the legendary Stradivarius. Plus, how houses are built out of volcanic rock

Dr Jeff and Petra train new vets at a wildlife sanctuary in Mexico. While there, they spay an endangered jaguar, and help an injured osprey

Dr Jeff performs a surgery he has never done before on a dog with laboured breathing. Dr Baier saves some neglected ornate box turtles

A dog is rushed to the clinic after being hit by a car. Four rats must be neutered before adoption and a girl rescues kittens in Grand Junction

When Wizard deckhand Lynn Guitard goes overboard, Keith and Monte scramble to rescue him. Sig lets Sophia prove herself at the Russian line.

Greenhorn Todd's abscessed tooth forces Rick to consider a costly return to port. Sig gives protégé 'Bob' the helm for her first-ever opilio season.

As Arctic ice wreaks havoc on the fishing grounds, Rick risks losing a fortune in crab pots. Johnathan tests the Time Bandit's reinforced bow.

Captains Sig and Sophia shift their strategy as injuries plague the Northwestern deck crew. Jake loses power in heavy seas on the Cornelia Marie.

Sig and Sophia score some hybrid crab, but a tank imbalance risks capsizing the Northwestern. The Time Bandit crew races incoming ice to get OJ home.

Sig races to jettison pots to repair a flooding compartment below deck. Rick enlists the Time Bandit to hide hot fishing until Jake calls their bluff.

Tony digs out a dozer and two trucks in the Midas Cut. Parker pushes to get his second wash plant running. Buzz struggles to assemble a new plant

Builder Chase Morrill and his team rebuild an old oyster shack for a working farm. They have their tightest deadline to date and a budget of only $25,000.

Two renovators have purchased land in a remote part of Colorado, and they plan on using a rammed-earth process to construct all-natural walls

Stung by Patrick's criticism, Allison crafts debris into a fishing net. A tropical storm pounds the survivalists. A team must abandon their camp.

Josh chases riches stolen by British loyalists during the American Revolution and helps dig up a cache of coins plundered by the infamous Doan Gang

Josh investigates the shocking rumours surrounding a Turkish dig site 6,000 years older than Stonehenge. Josh finds evidence of tribal skull rituals

Experts uncover where a black hole's energy originates. They examine what happens when the two most powerful objects in the cosmos collide

Italian rally legend Miki Biasion joins the boys as they transform a Lancia Integrale, like the one Miki drove to World Rally gold in the '80s.

In Montana, a family's friends call the Raneys to save them before La Nina weather strands them without a suitable cabin or food storage to survive.

Buying goods from home

Buying goods from home

In 25-foot seas, Sig's engine runs wild, Jake loses power, John's crane cracks, and Rick replaces a lacklustre deckhand with a returning favourite.