What It’s Like to Be at the Bottom of the Ocean

The submersible descends into the darkness.

You are in a metal sphere that is not much wider than your outstretched arms. It is uncomfortable, cramped and cold and there are no facilities. You can't hear any noise from the ocean, but you do hear the noise of the sub. The fan of the air scrubber drones as it takes carbon dioxide out of the air and as oxygen is released from cylinders so we can breathe. You hear the hissing noise of the ballasting which brings water into tanks to sink the sub so we can descend, or expels water to make it lighter to ascend. Propellers churn to move the sub forward and lift props mid-ship adjust the altitude.

That's deep sea scientist Peter Rona describing what it's like to dive in a submersible to the bottom of the sea.

Rona died last week. In exploring hydrothermal vents and ocean ridges, he made more than 100 trips to the depths in submersibles like the American Alvin, Russian Mirs, and Japanese Shinkais. He was the subject of an early 2000s IMAX film, Volcanoes of the Deep Sea.

Rona continues his description:

Descending into the ocean is sheer excitement. There are three tiny windows. One up front is for the pilot and two to either side are for observation. We bring down sandwiches as we can be in the subs for up to 20 hours. Soda is prohibited because it releases carbon dioxide that would throw the meters off scale. If you need to go to the bathroom there are containers for urination. So if you want to be comfortable, don't eat or drink before a dive.

As the dive progresses, it becomes colder because the temperature of the deep ocean outside is close to freezing and penetrates the metal hull, so you bundle up. If the sea is rough on top it takes a while to be recovered and at worst it can feel like you are in a washing machine. But I have never been frightened.

Filming the IMAX film was a challenge. The camera was so large that only the pilot and a camera operator could go down. The camera took the front window and making the pilot drive the sub using a video monitor. The windows are plastic. So if the sub gets too close to the hot vents the windows would soften from the heat of the smokers and implode almost instantaneously. But the pilots are very skillful and this never happened. I have been certified as co-pilot of the sub by the Navy.

The National Oceanic and Atmospheric Administration, where Rona worked for 25 years, continues exploring the deep ocean with submersibles and remote-operated vehicles. For a fascinating fictional exploration of these issues, check out J.M. Ledgard's Submergence.

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Alexis C. Madrigal

Alexis Madrigal is the deputy editor of TheAtlantic.com. He's the author of Powering the Dream: The History and Promise of Green Technology. More

The New York Observer has called Madrigal "for all intents and purposes, the perfect modern reporter." He co-founded Longshot magazine, a high-speed media experiment that garnered attention from The New York Times, The Wall Street Journal, and the BBC. While at Wired.com, he built Wired Science into one of the most popular blogs in the world. The site was nominated for best magazine blog by the MPA and best science website in the 2009 Webby Awards. He also co-founded Haiti ReWired, a groundbreaking community dedicated to the discussion of technology, infrastructure, and the future of Haiti.

He's spoken at Stanford, CalTech, Berkeley, SXSW, E3, and the National Renewable Energy Laboratory, and his writing was anthologized in Best Technology Writing 2010 (Yale University Press).

Madrigal is a visiting scholar at the University of California at Berkeley's Office for the History of Science and Technology. Born in Mexico City, he grew up in the exurbs north of Portland, Oregon, and now lives in Oakland.

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