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All Antarctica McMurdo Station Observation Tube

Observation Tube

A vertical tube that allows you to see what's going on underneath the Antarctic sea ice.

McMurdo Station, Antarctica

Added By
Michael Reinhardt
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Looking down into the Ob Tube   Eli Duke / CC BY-SA 2.0
Looking down into the Ob Tube   Eli Duke / CC BY-SA 2.0
  Michael Reinhardt / Atlas Obscura User
A jellyfish under the sea ice   Eli Duke / CC BY-SA 2.0
  Michael Reinhardt / Atlas Obscura User
  Michael Reinhardt / Atlas Obscura User
  Michael Reinhardt / Atlas Obscura User
  Michael Reinhardt / Atlas Obscura User
  Michael Reinhardt / Atlas Obscura User
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About

The Observation Tube, better known as the "Ob Tube" offers one of the most fascinating views at Antarctica's McMurdo Station. Installed annually into the sea ice, the tube descends 20 feet into the frigid ocean below. Glass windows at the bottom let viewers see the fish, seals, jellyfish, and other wildlife swimming. Looking back up, the underside of the sea ice appears blue-green because of the algae growing on it.

From the surface, the Ob Tube looks a little like one of the pipes that Mario jumps into. The opening measures just three feet across, so only one person is allowed down at a time. (Several people have gotten stuck and needed to get rescued!)

After climbing into the Ob Tube, you'll find metal hand and foot holds for most of the 20-foot journey, followed by a short section of rope ladder. Once you reach the bottom, windows allow you to see out in every direction.

The Ob Tube is also an excellent place to hear Weddell Seals. Their otherworldly trills and chirps, which to some sound like robots or even aliens, travel far underwater.

Related Tags

Underwater Tunnels Oceans Ice Research

Community Contributors

Added By

Michael Reinhardt

Edited By

Michelle Cassidy

  • Michelle Cassidy

Published

March 15, 2024

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Sources
  • https://www.jpl.nasa.gov/blog/2015/11/ob-tube
  • https://icyseals.com/journal/2017/12/2/the-observation-tube
  • https://blog.helenglazer.com/2016/03/22/the-ob-tube-a-peek-beneath-the-sea-ice/
Observation Tube
McMurdo Station
Antarctica
-77.849174, 166.662689

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Photo of McMurdo Station

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Photo of McMurdo Station

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