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2:00 PM: Secrets Of The Underground (S1 E2) (S1) | Discovery Science | 4/30 2025 Discovery Science
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Episode 2

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Published: 2017
Episode: Mystery Of The Serpent Mound

Rob Nelson investigates mysterious tunnels under Denver's airport. Plus, in Ohio he tries to uncover the secrets of a giant serpent-shaped mound.

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Secrets Of The Underground (S1 E2)
2:00 PM

Secrets Of The Unde ...

Secrets Of The Underground (S1 E2)
3:00 PM

How the Universe Works (S5 E1)

How the Universe Works (S5 E1)
4:00 PM

How the Universe Works (S5 E2)

How the Universe Works (S5 E2)
5:00 PM

How the Universe Works (S5 E3)

How the Universe Works (S5 E3)
6:00 PM

How It's Made (S18 E1)

How It's Made (S18 E1)
6:30 PM

How It's Made (S18 E2)

How It's Made (S18 E2)
7:00 PM

How It's Made (S18 E3)

How It's Made (S18 E3)
7:30 PM

How It's Made (S18 E4)

How It's Made (S18 E4)
8:00 PM

How It's Made (S18 E5)

How It's Made (S18 E5)
8:30 PM

How It's Made (S18 E6)

How It's Made (S18 E6)
9:00 PM

In Search Of Monsters (S1 E1)

In Search Of Monsters (S1 E1)
10:00 PM

In Search Of Monsters (S1 E2)

In Search Of Monsters (S1 E2)
11:00 PM

The Alaska Triangle (S1 E3)

The Alaska Triangle (S1 E3)
12:00 AM

The Alaska Triangle (S1 E4)

The Alaska Triangle (S1 E4)
1:00 AM

How the Universe Works (S5 E1)

How the Universe Works (S5 E1)
2:00 AM

How the Universe Works (S5 E2)

How the Universe Works (S5 E2)
4:00 AM

Blowing Up History (S3 E10)

Blowing Up History (S3 E10)
5:00 AM

Blowing Up History (S3 E11)

Blowing Up History (S3 E11)

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