Building Chernobyl's MegaTomb

In 1986, in the heart of Ukraine, the Chernobyl nuclear reactor exploded, releasing 400 times more radiation than the Hiroshima Bomb. It was the world’s worst nuclear disaster. Thirty workers died, 50,000 people fled the nearest city, and radioactive fallout made an area larger than Long Island a no-go zone. Hastily, a so-called “sarcophagus” was built to contain the radioactive materials.

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Preview Season 44 Episode 8 Length 00:30 Premiere: 03/21/17

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Clip Length 05:30 Premiere Date 05/17/17

Should You Wash Your Hands?

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Building Chernobyl's MegaTomb Preview

Preview Length 00:30 Premiere Date 03/21/17

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Clip Length 01:06 Premiere Date 02/15/17

Snot 101

Clip Length 03:58 Premiere Date 02/08/17

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Clip Length 03:33 Premiere Date 01/26/17

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Clip Length 04:07 Premiere Date 01/26/17

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Clip Length 15:00 Premiere Date 01/19/17

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Clip Length 14:40 Premiere Date 12/07/16

Specials

Interview: Discovering Dark Energy and the Hubble Tension with Nobel Prize Winner Adam Riess

Length 1:16:19 Premiere Date 12/19/25

Interview: Evolution of New Species, Venom, Wings, and More with Sean B. Carroll

Length 1:24:09 Premiere Date 12/05/25

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Length 54:49 Premiere Date 11/21/25

Particles of Thought: The Extremophile’s Guide to Life

Length 1:11:15 Premiere Date 11/04/25

Interview: The Animal Translator with Erich Jarvis

Length 1:03:49 Premiere Date 10/21/25

Interview: Brain Guru with Heather Berlin

Length 1:28:59 Premiere Date 10/07/25

Interview: Bob and Mike’s Big Idea with Bob Hazen and Mike Wong

Length 1:11:13 Premiere Date 09/23/25

Interview: Black Hole Badass with Janna Levin

Length 1:19:54 Premiere Date 09/05/25

Interview: The Deepfake Detective with Hany Farid

Length 1:25:01 Premiere Date 08/26/25

Interview: Mind of a Fossil Hunter with Kirk Johnson

Length 1:37:18 Premiere Date 08/18/25

When Machines Prescribe

Length 17:19 Premiere Date 04/30/25

Sands of Time

Length 06:47 Premiere Date 09/13/24

Keepers of the Coastline

Length 11:56 Premiere Date 09/13/24

Tides of Tradition

Length 09:47 Premiere Date 09/13/24

Standing the Heat

Length 08:44 Premiere Date 09/13/24

Megadroughts and Indigenous Voices

Length 07:51 Premiere Date 09/13/24

Harvesting the Future

Length 09:22 Premiere Date 09/13/24

Sea Change: Survival in the Gulf of Maine

Length 53:30 Premiere Date 08/07/24

Sea Change: Peril in the Gulf of Maine

Length 53:30 Premiere Date 07/31/24

Sea Change: Bounty in the Gulf of Maine

Length 53:30 Premiere Date 07/24/24

When Whales Could Walk (Español)

Length 53:30 Premiere Date 01/01/24

Ancient Builders of the Amazon (Español)

Length 53:21 Premiere Date 02/15/23

Ancient Maya Metropolis (Español)

Length 53:31 Premiere Date 01/26/22

Picture a Scientist (with Audio Description)

Length 1:52:37 Premiere Date 04/14/21

Treasures Metals Eiffel Tower

Length 02:09 Premiere Date 12/09/16

A Labyrinth of Lava

Length 01:13 Premiere Date 11/02/15

From Mud to Rock

Length 01:36 Premiere Date 10/22/15

Finding Stromatolites

Length 01:23 Premiere Date 10/22/15

Stromatolites Were Kings

Length 01:05 Premiere Date 10/22/15

Ancient Life

Length 00:28 Premiere Date 10/22/15

Millions of Years Captured in Chalk

Length 01:17 Premiere Date 10/22/15

A Fourteen-Foot Fish From Kansas

Length 01:38 Premiere Date 10/22/15

Hell Creek Formation

Length 01:10 Premiere Date 10/22/15

No Dinosaurs Above the Line

Length 02:00 Premiere Date 10/22/15

Mammal Survivors

Length 01:40 Premiere Date 10/22/15

Dinosaur Fossils

Length 01:53 Premiere Date 10/22/15

King of Gore

Length 02:00 Premiere Date 10/22/15

Driving Dinosaur Diversity

Length 01:47 Premiere Date 10/22/15

Pangea

Length 00:56 Premiere Date 10/22/15

Making Granite From Volcanic Rock

Length 02:16 Premiere Date 10/22/15

A Massive Volcanic Eruption

Length 01:14 Premiere Date 10/22/15

Rock Time Capsules

Length 01:18 Premiere Date 10/21/15

The Sandstone Top of the Canyon

Length 01:15 Premiere Date 10/21/15

Fossil-Filled Limestone

Length 00:54 Premiere Date 10/21/15

The Grand Canyon's Oldest Rocks

Length 00:19 Premiere Date 10/21/15

From Lava to Land

Length 02:14 Premiere Date 10/21/15

Semi-Precious Pebbles

Length 00:57 Premiere Date 10/21/15

Five Steps of Volcanic Rock

Length 00:26 Premiere Date 10/21/15

Tearing North America Apart

Length 01:01 Premiere Date 10/21/15

Fossilized Sand Dunes

Length 01:15 Premiere Date 10/21/15

Volcanoes of Sand

Length 01:33 Premiere Date 10/21/15

Rockies 2.0

Length 02:00 Premiere Date 10/21/15

Manhattan Schist

Length 01:13 Premiere Date 10/21/15

Manhattan Skyline

Length 00:52 Premiere Date 10/21/15

New York's Mountains

Length 01:13 Premiere Date 10/21/15

Mendenhall Glacier

Length 02:51 Premiere Date 08/02/15

Monument Rocks 1

Length 01:18 Premiere Date 08/02/15

Monument Rocks 2

Length 01:48 Premiere Date 08/02/15

Exuma Cays 1

Length 01:26 Premiere Date 08/02/15

Exuma Cays 3

Length 00:28 Premiere Date 08/02/15

Exuma Cays 4

Length 03:22 Premiere Date 08/02/15

Gooseberry Falls 1

Length 00:57 Premiere Date 08/02/15

Gooseberry Falls 2

Length 00:24 Premiere Date 08/02/15

Gooseberry Falls 3

Length 01:06 Premiere Date 08/02/15

Gooseberry Falls 4

Length 01:01 Premiere Date 08/02/15

Mount Kilauea

Length 01:30 Premiere Date 08/02/15

Grand Canyon 1

Length 01:19 Premiere Date 08/02/15

Grand Canyon 2

Length 01:05 Premiere Date 08/02/15

Grand Canyon 3

Length 00:58 Premiere Date 08/02/15

Grand Canyon 4

Length 00:19 Premiere Date 08/02/15

Lethal Seas Excerpt 1

Length 04:11 Premiere Date 05/12/15

Lethal Seas Excerpt 2

Length 01:00 Premiere Date 05/12/15

Lethal Seas Excerpt 3

Length 00:35 Premiere Date 05/12/15

Lethal Seas Excerpt 4

Length 00:51 Premiere Date 05/12/15

The Mother of Hubble

Length 02:28 Premiere Date 04/14/15

Formation of a Typhoon

Length 01:34 Premiere Date 06/25/14

Flatfish Larvae

Length 00:51 Premiere Date 05/06/14

RNAi Explained

Length 01:47 Premiere Date 04/22/14

Dolphin Mirror

Length 03:18 Premiere Date 04/22/14

Dogs' Sense of Time

Length 01:28 Premiere Date 04/13/14

Cockatoo Excerpt

Length 01:30 Premiere Date 04/08/14

How Solar Cells Work

Length 00:33 Premiere Date 02/26/14

Solar Power's Promise

Length 00:51 Premiere Date 02/26/14

Microneedle

Length 01:41 Premiere Date 12/30/13

GM Plants

Length 01:27 Premiere Date 11/15/13

Non-Newtonian Gel

Length 01:00 Premiere Date 11/15/13

Soft-Story Buildings

Length 07:36 Premiere Date 11/13/13

Levitation

Length 00:50 Premiere Date 10/24/13

Superconductor

Length 01:47 Premiere Date 10/24/13

Animal Robot 1

Length 02:35 Premiere Date 10/24/13

Animal Robot 2

Length 02:02 Premiere Date 10/24/13

Therapeutic Hypothermia

Length 01:11 Premiere Date 10/24/13

Therapeutic Hypothermia 2

Length 01:07 Premiere Date 10/24/13

Therapeutic Hypothermia 3

Length 01:43 Premiere Date 10/24/13

Therapeutic Hypothermia 4

Length 02:01 Premiere Date 10/24/13

Swarming Robots

Length 01:31 Premiere Date 10/21/13

Sneak Peek: Making Stuff Wilder

Length 06:14 Premiere Date 10/21/13

Virus Battery

Length 02:21 Premiere Date 10/19/13

Robot Arm

Length 00:56 Premiere Date 10/19/13

Elephant Arm

Length 01:22 Premiere Date 10/19/13

FinGripper

Length 00:55 Premiere Date 10/19/13

Sail Wing

Length 01:02 Premiere Date 10/19/13

Hydrofoil

Length 01:01 Premiere Date 10/19/13

Chicken Feathers

Length 01:56 Premiere Date 10/19/13

KillaCycle

Length 00:48 Premiere Date 10/19/13

How Batteries Work

Length 00:49 Premiere Date 10/19/13

Muon Detection

Length 01:52 Premiere Date 10/19/13

Muons

Length 01:25 Premiere Date 10/19/13

Plants White

Length 02:11 Premiere Date 10/19/13

DNA Patch

Length 01:19 Premiere Date 10/19/13

DNA Vaccine

Length 00:38 Premiere Date 10/19/13

Earthquake Test

Length 02:03 Premiere Date 10/19/13

David Drives

Length 01:27 Premiere Date 10/19/13

Shelley

Length 02:07 Premiere Date 10/19/13

Pitcher Plant

Length 01:48 Premiere Date 10/17/13

SLIPS

Length 01:01 Premiere Date 10/17/13

Hagfish

Length 00:51 Premiere Date 10/17/13

Hagfish Defense

Length 01:36 Premiere Date 10/17/13

Slime Clothes

Length 01:00 Premiere Date 10/17/13

New York City One Year Later: Telecommunications

Length 03:14 Premiere Date 10/16/13

Sneak Peek: Making Stuff Faster

Length 05:06 Premiere Date 10/15/13

David's Race

Length 01:28 Premiere Date 10/15/13

Steffen's Plan

Length 01:59 Premiere Date 10/15/13

Traveling Salesman

Length 01:21 Premiere Date 10/15/13

Eye Robot

Length 01:51 Premiere Date 10/10/13

Corkscrew Robot

Length 00:32 Premiere Date 10/10/13

Slow Goldfish

Length 01:39 Premiere Date 10/10/13

Bee Toxin

Length 01:31 Premiere Date 10/10/13

Mild Traumatic Brain Injury

Length 03:36 Premiere Date 10/07/13

Invisibility Cloak

Length 01:22 Premiere Date 09/24/13

Shape Memory Alloys

Length 00:32 Premiere Date 09/08/13

Jellyfish

Length 00:38 Premiere Date 09/08/13

Bird Wings

Length 01:56 Premiere Date 09/08/13

Shrinking Chips

Length 01:06 Premiere Date 09/05/13

Pizza Transistor

Length 01:34 Premiere Date 09/05/13

Graphene

Length 01:11 Premiere Date 09/05/13

Wheat Straw Plastic

Length 01:04 Premiere Date 08/29/13

Solar Leaves

Length 00:53 Premiere Date 08/29/13

Battle Jacket

Length 01:49 Premiere Date 08/29/13

Oobleck

Length 00:40 Premiere Date 08/29/13

Magnetic Oobleck

Length 00:54 Premiere Date 08/29/13

Life-Saving Non-Newtonian Fluids

Length 01:43 Premiere Date 08/29/13

Silicon Transistors

Length 00:50 Premiere Date 08/29/13

Starling 8

Length 00:44 Premiere Date 07/15/13

sandy-raw-1-2

Length 00:04 Premiere Date 07/08/13

sandy-raw-5-1

Length 01:02 Premiere Date 07/08/13

Chemotherapy Goes Small

Length 01:17 Premiere Date 07/01/13

The Making of a Cloud Old

Length 03:10 Premiere Date 06/30/13

Why So Many Cloud Types?

Length 03:35 Premiere Date 06/30/13

Clouds and Weather

Length 03:21 Premiere Date 06/30/13

Severe Storms

Length 03:37 Premiere Date 06/30/13

The Climate Wild Card

Length 03:02 Premiere Date 06/30/13

Life on Europa?

Length 02:25 Premiere Date 06/09/13

CloudLab_Megastorm_03

Length 01:41 Premiere Date 05/29/13

CloudLab_Megastorm_04

Length 01:43 Premiere Date 05/29/13

CloudLab_Megastorm_05

Length 01:04 Premiere Date 05/29/13

CloudLab_Megastorm_06

Length 00:40 Premiere Date 05/29/13

CloudLab_Megastorm_07

Length 03:07 Premiere Date 05/29/13

CloudLab_Megastorm_01

Length 00:35 Premiere Date 05/28/13

CloudLab_Megastorm_02

Length 00:31 Premiere Date 05/28/13

What Made the 1918 Flu So Deadly?

Length 01:28 Premiere Date 05/13/13

How the 1918 Flu Infected People

Length 00:25 Premiere Date 05/13/13

Fertilizing the Amazon

Length 03:27 Premiere Date 04/21/13

Flu Probabilities

Length 01:53 Premiere Date 04/16/13

Rare Earth Elements

Length 04:17 Premiere Date 04/01/13

CHNOPS: Ingredients for Life

Length 02:36 Premiere Date 03/12/13

Electromagnetic Spectrum

Length 00:44 Premiere Date 02/28/13

MODIS Sensor

Length 00:26 Premiere Date 02/28/13

Solving the Storage Problem

Length 02:26 Premiere Date 10/25/12

Putting Energy to Use Old

Length 02:14 Premiere Date 10/08/12

Season 44 Episodes

Show Episodes

Show Clips & Previews

Bird Brain

S44 E20 Length 53:32 Premiere Date 12/20/17

Killer Volcanoes

S44 E16 Length 54:10 Premiere Date 10/04/17

Building Chernobyl's MegaTomb

S44 E8 Length 52:55 Premiere Date 04/26/17

The Case for Eating Bugs

Clip Length 04:26 Premiere Date 06/21/17

Grow Your Own Crystals

Clip Length 03:38 Premiere Date 06/08/17

WannaCry Cyberattack Explained

Clip Length 01:56 Premiere Date 05/24/17

Meet the Gastric-Brooding Frog

Clip Length 05:30 Premiere Date 05/17/17

Should You Wash Your Hands?

Clip Length 04:40 Premiere Date 05/10/17

Building Chernobyl's MegaTomb Preview

Preview Length 00:30 Premiere Date 03/21/17

Is Fear Contagious

Clip Length 05:17 Premiere Date 02/15/17

Scientists Walking Confidently

Clip Length 01:06 Premiere Date 02/15/17

Snot 101

Clip Length 03:58 Premiere Date 02/08/17

A Scientist Walks Into A Bar #2

Clip Length 03:33 Premiere Date 01/26/17

A Scientist Walks Into A Bar #1

Clip Length 04:07 Premiere Date 01/26/17

What Makes Science True?

Clip Length 15:00 Premiere Date 01/19/17

Zika: The Untold Story

Clip Length 14:40 Premiere Date 12/07/16

See All Episodes

TV Schedules

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Your Brain: Perception Deception - S50 E9

Join neuroscientist Heather Berlin on a quest to understand how your brain shapes your reality, and why you can't always trust what you perceive. Learn the surprising tricks and shortcuts the brain takes to help us survive.

Sunday April 5, 2026 7:00 pm ET on KET2
Sunday April 5, 2026 6:00 pm CT on KET2
Tuesday April 7, 2026 1:00 am ET on KET2
Tuesday April 7, 2026 12:00 am CT on KET2

Your Brain: Who's in Control? - S50 E10

Dive into the latest research on the subconscious to see what's really driving the decisions you make.

Wednesday April 8, 2026 9:00 pm ET on KET
Wednesday April 8, 2026 8:00 pm CT on KET
Thursday April 9, 2026 5:00 pm ET on KET
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Athens: Birth of Democracy - S53 E7

Archaeologists investigate the dramatic origins of democracy in ancient Greece 2,500 years ago. Mass graves and ancient ruins where tyrants were murdered shine new light on the birth of a revolutionary form of government.

Wednesday April 15, 2026 9:00 pm ET on KET
Wednesday April 15, 2026 8:00 pm CT on KET
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Rain Bombs - S53 E5

Scientists race to understand catastrophic weather events known as "rain bombs" and how we can protect ourselves from their growing power.

Wednesday April 22, 2026 9:00 pm ET on KET
Wednesday April 22, 2026 8:00 pm CT on KET
Thursday April 23, 2026 5:00 pm ET on KET
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Tuesday April 28, 2026 1:00 am ET on KET2
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Return to the Moon - S53 E8

Follow the Artemis II engineers and crew on a perilous 10-day journey to orbit the Moon.

Wednesday April 29, 2026 9:00 pm ET on KET
Wednesday April 29, 2026 8:00 pm CT on KET
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Your Brain: Perception Deception - S50 E9

Friday April 3, 2026 2:00 am ET on KET
Friday April 3, 2026 1:00 am CT on KET
Thursday April 2, 2026 5:00 pm ET on KET
Thursday April 2, 2026 4:00 pm CT on KET
Wednesday April 1, 2026 9:27 pm ET on KET
Wednesday April 1, 2026 8:27 pm CT on KET

Baltimore Bridge Collapse - S52 E6

Tuesday March 31, 2026 5:00 am ET on KET2
Tuesday March 31, 2026 4:00 am CT on KET2
Tuesday March 31, 2026 12:00 am ET on KET2
Monday March 30, 2026 11:00 pm CT on KET2
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Pompeii's Secret Underworld - S52 E5

Tuesday March 24, 2026 5:00 am ET on KET2
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The Planets: Mars - S46 E13

Thursday March 12, 2026 4:30 pm ET on KET
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Stone Age Temple Mystery - S53 E6

Tuesday March 3, 2026 5:00 am ET on KET2
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Top

Building Chernobyl's MegaTomb

Recent Episodes

Stone Age Temple Mystery

Mammal Origins

Can Dogs Talk?

Angkor: Hidden Jungle Empire

Asteroids: Spark of Life?

Operation Space Station: Science and Survival

Sponsored by:

Clips & Previews

The Case for Eating Bugs

Grow Your Own Crystals

WannaCry Cyberattack Explained

Meet the Gastric-Brooding Frog

Should You Wash Your Hands?

Building Chernobyl's MegaTomb Preview

Is Fear Contagious

Scientists Walking Confidently

Snot 101

A Scientist Walks Into A Bar #2

A Scientist Walks Into A Bar #1

What Makes Science True?

Zika: The Untold Story

Specials

Interview: Discovering Dark Energy and the Hubble Tension with Nobel Prize Winner Adam Riess

Interview: Evolution of New Species, Venom, Wings, and More with Sean B. Carroll

Interview: De-Extinction, Dire Wolves, and Jurassic Park with Beth Shapiro

Particles of Thought: The Extremophile’s Guide to Life

Interview: The Animal Translator with Erich Jarvis

Interview: Brain Guru with Heather Berlin

Interview: Bob and Mike’s Big Idea with Bob Hazen and Mike Wong

Interview: Black Hole Badass with Janna Levin

Interview: The Deepfake Detective with Hany Farid

Interview: Mind of a Fossil Hunter with Kirk Johnson

When Machines Prescribe

Sands of Time

Keepers of the Coastline

Tides of Tradition

Standing the Heat

Megadroughts and Indigenous Voices

Harvesting the Future

Sea Change: Survival in the Gulf of Maine

Sea Change: Peril in the Gulf of Maine

Sea Change: Bounty in the Gulf of Maine

When Whales Could Walk (Español)

Ancient Builders of the Amazon (Español)

Ancient Maya Metropolis (Español)

Picture a Scientist (with Audio Description)

Treasures Metals Eiffel Tower

A Labyrinth of Lava

From Mud to Rock

Finding Stromatolites

Stromatolites Were Kings

Ancient Life

Millions of Years Captured in Chalk

A Fourteen-Foot Fish From Kansas

Hell Creek Formation

No Dinosaurs Above the Line

Mammal Survivors

Dinosaur Fossils

King of Gore

Driving Dinosaur Diversity

Pangea

Making Granite From Volcanic Rock

A Massive Volcanic Eruption

Rock Time Capsules

The Sandstone Top of the Canyon

Fossil-Filled Limestone

The Grand Canyon's Oldest Rocks

From Lava to Land

Semi-Precious Pebbles

Five Steps of Volcanic Rock

Tearing North America Apart

Fossilized Sand Dunes

Volcanoes of Sand

Rockies 2.0

Manhattan Schist

Manhattan Skyline

New York's Mountains

Mendenhall Glacier