Topic: underground

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How does a tunnel boring machine work?

How are new subway tunnels constructed underneath a busy city like Barcelona, Spain? This promotional animation demonstrates how a tunnel boring machine—specifically a Herrenknecht TBM with an Earth Pressure Balance S...

The Archaeology of Crossrail and the history of London

The construction of London’s newest railway, which will be known as the Elizabeth line when services begin in 2018, has given archaeologists a unique chance to explore some of the city’s most historically important si...

Genevieve von Petzinger & the invention of graphics on cave walls

Northern Spain's Cueva de El Castillo and Cueva de La Pasiega both contain incredible specimens of Franco-Cantabrian cave art, paintings and engravings in Cantabria province and southwestern France. El Castillo cave i...

Hydnora africana, the strangest plant in the world?

With no leaves and no chlorophyll, Southern Africa's Hydnora africana is a underground-dwelling parasitic plant in that gets all of its sugars, minerals, and water by attaching to the roots of Euphorbia plants. It als...

A Real-Life Bone Collector: Recovering an Extinct Human Ancestor

Follow biological anthropologist and 'bone collector' Dr. Marina Elliott deep into the ancient underground crevasses that would reveal around 1,500 bone fragments belonging to Homo naledi, a new species in human linea...

These Carnivorous Worms Catch Bugs by Mimicking the Night Sky

These slimy threads are 'fishing' lines in New Zealand's Waitomo Caves. The lures are the bioluminescent glow of Arachnocampa luminosa, or glow worms. Their carnivorous larvae create a starry night sky a half a mile d...

A puffin and its puffling surface from their underground nest

Though puffins spend much of their life at sea, when they nest on land, they nest underground in the Farne Islands and elsewhere around the globe. Their babies are called pufflings, and in this BBC Earth clip from Wor...

How Does It Grow? Potatoes

Potatoes are stem tubers, nutrient underground storage organs for the nightshade Solanum tuberosum L. Domesticated around 7,000–10,000 years ago in Peru and Bolivia, potatoes are now the fourth most-farmed crop on Ear...

The Great Stalacpipe Organ deep in Luray Caverns

Not far from Virginia's Shenandoah National Park, deep in the damp Luray Caverns, is a giant lithophone -- a pipeless organ that strikes 37 stalactites with solenoid-actuated rubber mallets in order to produce 37 beau...

40,000 years of London history created with papercraft

Peel back the pavement of a grand old city like London and you can find just about anything, from a first-century Roman fresco to a pair of medieval ice skates—even an elephant’s tooth. As one of Europe’s oldest capit...

4K NYC Subway time lapse: Riding the Queens-bound 7 line

Experience the New York City subway -- specifically the Queens-bound 7 line -- from the train operator's vantage point at the front of the train in this NYC subway time lapse from Dj Hammers. The total real time ride ...

How New York City’s subway technologies are being modernized

"People know that the system is old, but I don't think they realize just how old it is... in our system, it's not just the architecture that's 100 years old. It's a lot of the basic technology, as well. The infrastruc...

Seed germination to growth time lapses by Neil Bromhall

To see the unseen through technology is one of our favorite things, so we love watching Neil Bromhall's beautifully scored plant growth time lapse videos. Above, a compilation of germination to growth footage. Seeds i...

From seed to sapling – Time lapse of an oak tree

Over the course of eight months, Neil Bromhall filmed a sprouting acorn, one that he would eventually plant as an oak tree sapling in his garden: The acorn was collected in September and filmed in an underground s...

Antarctica’s Ice Formations: Volcanic ice caves & undersea brinicles

The caves of Mount Erebus, Antarctica's only active volcano, hide fragile and sparkling secrets: spectacular ice stalagmites, stalactites, shards, and feather-like crystals that form from the volcanic steam and gases ...

Subway musicians play together from 9 different subway stations

In Chris Shimojima's Signal Strength, eleven musicians unite in a live experiment about connectivity and community: they play a song together from nine different New York City subway stops with the help of WiFi-enable...

Meet the People Who Retrieve the Stuff You Drop On the Tracks

What happens if you drop your stuffed bunny rabbit on the tracks of the New York City Subway System? Never jump down to get it! Instead, go to the booth and tell them what and where. The booth clerk calls Rail Command...

The Pangaea Pop-up – TED Ed

This papercraft pop-up book illustrates how South America and Africa used to be connected, how the supercontinent Pangaea broke apart 200 million years ago, how the Earth's seven primary tecto...

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