A Tour of Biosphere 2 in Oracle, Arizona

Updated on March 22, 2018
Ramkitten2000 profile image

I've lived in Flagstaff, AZ, since 2003, where I'm an active member of the Coconino County Sheriff's Search & Rescue team and an avid hiker.

Biosphere 2
Biosphere 2

A couple of years ago, on a road trip around southern Arizona without an itinerary, my husband and I made a spontaneous stop at a place called Biosphere 2 near a town called Oracle.

I'd heard of Biosphere 2 many years earlier in college while studying Environmental Conservation, but I didn't recall the details. Just something about a group of people sealing themselves inside the place for two years. So as primary navigator on our adventure, when I saw "Biosphere" on the map, I suggested we make a stop and see what it was all about.

And we were glad we did. What a fascinating place, Biosphere 2 -- a glassed-in world of mangrove wetlands, tropical rainforest, savanna grassland and coral reefs in the middle of the Sonoran Desert.

A biosphere is....

1. the part of the world where life can exist

2. living organisms together with their environment

--Merriam-Webster Dictionary

The Original Biosphere

The Original Biosphere
The Original Biosphere

What is Biosphere 2?

Like Earth Under Glass

Biosphere 2, constructed between 1987 and 1991, was used to study the interactions within life systems and explore the potential use of closed biospheres for space colonization. The facility allowed scientists and students to manipulate a biosphere without harming the Earth, and to monitor the chemistry of the air, water and soil inside. Biosphere 2 was the largest closed system ever created.

The basement area of Biosphere 2, called the "Technosphere," is where all the electrical, plumbing and mechanical systems are housed. Included are 26 air handlers that heat and cool the air, remove particles, maintain humidity levels, and generate and condense water for rain and fog and to resupply the man-made ocean.

The building with the arched segments and three towers seen in the picture above is the Energy Center. Biosphere 2 requires continuous power to maintain proper conditions for the living organisms inside and for ongoing experiments.

Given Biosphere 2's location in the Sonoran desert, with daytime summer temperatures often reaching into the 90s and sometimes triple digits, a power failure on a sunny day would irreparably damage -- that is, cook -- the plants inside the facility within twenty minutes. But a large generator maintains power and controls the biomes during the frequent outages during monsoon season.

The primary generator inside the Energy Center is fueled by natural gas, while a back-up generator runs on diesel. In addition to the generators, there are boilers for heating water and chillers for cooling it. The large towers are used to cool air by drawing it across a column of water.

Between 1991 and 1994, two missions sealed Biospherians inside the glass enclosure to study survivability. These were very public experiments but also very useful, furthering our understanding of ecology.

The University of Arizona assumed management of Biosphere 2 in June, 2007.

Biosphere 2
Biosphere 2 | Source

Biosphere 2: A Visitor Poll

Have you been there?

See results

Interesting Facts About Biosphere 2

  1. Biosphere 2 is a 3.14-acre facility on a 40-acre campus.
  2. It has 7,200,000 cubic feet of sealed glass.
  3. The main enclosure is 91 feet at its highest point.
  4. The facility is sealed from below by a 500-ton welded stainless steel liner.
  5. Biosphere 2 has 300,000 sq. ft. of administrative offices, classrooms, labs, conference center, and housing.
  6. The elevation of Biosphere 2 is 3,820 feet.

From the official website, by the University of Arizona.

Tour Biosphere 2
Tour Biosphere 2 | Source

The Guided Tour

Well worth the price of admission.

My husband and I hesitated at the $20 per person cost of the tour (discounted rates are offered to AAA members, seniors, kids and military), though half the fee goes to support research at Biosphere 2 and qualifies as a tax-deductible contribution. But we were in vacation mode, so we went ahead with it. And we weren't sorry. It was lengthy tour, informative and fun, well worth the money. We also enjoyed exploring the grounds after the guide departed.

The tour begins in the human habitat area, where you'll see one of the apartments where the "Biospherians" lived, the farm where they grew their crops and the kitchen where they prepared their meals.

You'll then enter the wilderness areas through the airlock door, where you experience the various environments inside Biosphere 2, beginning with the tropical savanna.

The trail system works its way along the 40-foot ocean cliff where you can look down into the million-gallon tropical ocean. As you move along, you descend into the lower savanna along the mangrove wetlands, through the tropical thorn scrub and into the coastal fog desert.

From the desert, you enter the "technosphere," where mechanical systems control the Biosphere 2 environments. From the technosphere, you make your way into the tropical rainforest which contains over 150 different species of plants, some more than 60 feet tall.

Finally, you descend through a tunnel into one of two "lungs." The lungs are large geodesic domes that originally prevented Biosphere 2 from exploding or imploding.

I also remember seeing the ocean from below, through large windows.

These guided tours are given throughout the day. And group and school tours can also be arranged. Call (520) 838-6200 for more information and reservations of groups of 20 or more.

A View of the Ocean in Biosphere 2

A View of the Ocean in Biosphere 2
A View of the Ocean in Biosphere 2

A Look Inside Biosphere 2 - About the Tours

The Human Experiments

There were two at Biosphere 2.

The first closed mission, which lasted from September 26, 1991, to September 26, 1993, included a crew of 8 researchers and a medical doctor. This mission was fraught with problems. Or challenges, rather.

For one, oxygen inside the facility fell steadily and, after 16 months, had decreased 14.5%, to a level equivalent to the oxygen available at an elevation of 18,000 feet. The doctor closely monitored oxygen levels and consulted with doctors on the outside. Eventually, he requested that pure oxygen be pumped in, and two more injections were needed after that.

Apparently, this issue was caused in part by low light levels. The weather that year was unusually overcast, which reduced photosynthesis. Not to mention that the structure's support beams also blocked a significant amount of light.

Many suspected the oxygen drop was due to microbes that had been added to the soil in the savanna, rain forest, and agricultural sections to aid plant growth. And the amount of carbon installed in the soil at the beginning of the experiment was too high. Scientists believed that these microbes were consuming too much oxygen from the air and converting the carbon in the soil into carbon dioxide.

One problem critics of this theory cited was that microbes breathing that much oxygen would also create a huge amount of carbon dioxide. So the increase in CO2 would have been greater than what was detected. More investigation revealed that the concrete throughout the facility was absorbing the oxygen because it had not fully cured. This allowed for a marked drop in oxygen levels without a significant rise in carbon dioxide.

Biosphere 2 also suffered from wildly fluctuating CO2 levels, and most of the vertebrates and all of the pollinating insects died. Ants were purposely introduced since they were a companion to one of the tree species in the rain forest. But by 1993, a species local to the area, which had been unintentionally sealed in, dominated.

Another problem reported by the nine Biospherians was continual hunger. While some crops, like bananas, peanuts and sweet potatoes, grew well, the very active inhabitants weren't able to grow enough food to satisfy their appetites.

The second closed mission with seven crew members began on March 6, 1994, with an intended ten-month span, but it ended prematurely six months later. During that time, a dispute amongst the management team led to the ousting of the on-site management by federal marshals and the issuance of a restraining order. And as juvenile as it sounds, in the wee hours of the morning on April 5th, 1994, two members of the first mission's crew deliberately vandalized the project, opening all doors and violating the enclosure. Soon after that, the captain of the team left.

Watch a video interview of the first closed mission, as Jane Poynter, author of The Human Experiment, describes her two years and twenty minutes inside Biosphere 2.

Video: The Human Experiment - Footage from inside Biosphere 2 from 1991 - 1993

Who Is John Allen?

Talk about a busy man...

Born in 1929, John Polk Allen is the inventor and co-founder of the Biosphere 2 project.

Allen's extensive resume also includes his role as the former Executive Chairman and Director of Biospheric Research Development & Engineering for Space Biospheres Ventures.

He co-founded and, until 2006, served as Chairman of the Planetary Coral Reef Foundation, a non-profit devoted to monitoring the health and vitality of coral reefs, and exploring the origins of human cultures aboard the Heraclitus, a special research vessel he invented in 1974. The Heraculitus has sailed over 200,000 nautical miles around the world.

Currently the Chairman of Global Ecotechnics Corporation, John Allen designs a second generation of materially closed, biospheric and ecologically enriched biomic systems.

Allen studied anthropology and history at Northwestern, Stanford, and Oklahoma Universities, and served in the U.S. Army's Engineering Corps as a machinist. He graduated from the Colorado School of Mines and received an MBA from the Harvard Business School.

On top of all that and more, the prolific John Allen has written novels, poetry, short stories and plays under the pen name, Johnny Dolphin.

Fun Fact

There are 6,500 windows in Biosphere 2!

More About Little Oracle, Arizona, Home of Biosphere 2

Population 3,563 (as of January, 2008)

Located 38 miles from downtown Tucson, Oracle is one of the communities that make up Pinal County, Arizona. Aside from being the home of Biosphere 2, Oracle was the also official home of environmentalist author Edward Abbey. Another well-known resident was Buffalo Bill Cody, who owned a mine there for a short time and built a house. The area is also known for its outdoor recreation, like great hiking, mountain biking and horseback riding in the 4,000-acre Oracle State Park.

Other things to do in Oracle include:

  • The Oracle Run, a 6.2 mile run over steep and hilly terrain, held every year on a Saturday close to Halloween
  • The Calabazas (Pumpkin) Festival, held every year in October at Oracle State Park
  • GLOW, an evening of art and music held one weekend in the fall

    at Triangle L Ranch by the light of the full moon

  • The Oracle Oaks Festival and Oracle Car Show, held every year in the spring to benefit the Community Center and the Oracle Historical Society

For more information on this rockin' town, visit the Community Guide to Oracle, Arizona.

Biosphere 2 is near Oracle, Arizona
Biosphere 2 is near Oracle, Arizona

Finding Oracle

Oracle, AZ

get directions

Driving Directions to Biosphere 2

From Central Tucson:

*Go north to River Road and turn left (heading west).

*Continue on River Road and turn right (north) on Oracle Road (Arizona Highway 77).

*Continue north approx. 24 miles on Oracle Road/Highway 77, to Biosphere 2 Road at Mile Post 96.5, and turn right.

Google Map from Tucson to Biosphere 2

From Phoenix Sky Harbor International Airport:

*After leaving the airport, follow the signs to Interstate 10 East.

*Take I-10 East, toward Tucson, to Exit 185 and exit the interstate.

*Turn left onto Highway 387 and continue past Coolidge until Highway 387 intersects with Arizona Highway 79 near Florence.

*Turn right on to Highway 79 and follow this until Oracle Junction where you turn left onto Arizona Highway 77.

*Drive 6 miles to the Biosphere 2 turnoff, located at Mile Post 96.5. Turn right on Biosphere Road.

Google Map from Phoenix Sky Harbor Airport to Biosphere 2

Questions & Answers

  • What is the internal temperature of Biosphere 2?

    I don't know the specific answer to that, but I do know the temp varied in the different biomes--some cooler, some warmer, some humid, others dry-- which makes sense of course. The living areas for the scientists were a very comfortable temperature, but I don't knoe if they could each regulate a thermostat in their own areas.

© 2009 Deb Kingsbury

Ever Been to Biosphere 2? What did you think?

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    • studyaids profile image

      Steve Jones 

      8 years ago from Birmingham UK

      A truly wonderful and useful lense. Thanks

    • TonyPayne profile image

      Tony Payne 

      8 years ago from Southampton, UK

      This sounds like an amazing place to visit. last year we went to The Eden Project, which is a similar structure in Cornwall UK, with geodesic domes, but it's not a sealed unit. Ultimately, if we are going to live on The Moon or Mars etc, it will almost certainly have to be in a structure like this, so these experiments are vital. I came, I enjoyed, and I left a blessing behind.

    • profile image


      9 years ago

      Biosphere 2 also suffered from wildly fluctuating CO2 levels, and most of the vertebrates and all of the pollinating insects died. Ants were purposely introduced since they were a companion to one of the tree species in the rain forest. But by 1993, a species local to the area, which had been unintentionally sealed in, dominated.

    • profile image


      9 years ago

      Thanks for your wonderful story about your trip. I has really inspired me in my work.

      Thank you and God bless.

    • mbgphoto profile image

      Mary Beth Granger 

      9 years ago from O'Fallon, Missouri, USA

      Really interesting...thanks for the introduction...blessed.

    • Luminosity LM profile image

      Luminosity LM 

      9 years ago

      I hope we keep on dreaming and acting big by doing that we will continue to learn and explore a vast world full of fun adventure and education.

    • Senora M profile image

      Senora M 

      9 years ago

      This sounds really cool. I haven't been here, but it reminds me of the Pauly Shore movie, Biodome. :)

    • profile image


      9 years ago

      recreate a little earth it's a good idea like always scientist overestimate there knowledge and fail because bacterie remind me a book "war of the world "

      I think if we need to controle the amount of oxygen make by nature we need a computer to make controle every second of all the factor and they're developpement and died really hard for use one of the big problem with long space travel

    • OhMe profile image

      Nancy Tate Hellams 

      9 years ago from Pendleton, SC

      The Biosphere 2 sounds fascinating. Thank you for adding this to the plexo on my Promote Local Businesses and Events. I really enjoyed this visit.

    • lolicious profile image


      10 years ago

      This is something I have wanted to see for awhile now. Thanks for this lens, its as close as I will get for now :)

    • RhondaAlbom profile image

      Rhonda Albom 

      10 years ago from New Zealand

      This lens is outstanding and makes the place seem truly wonderful and interesting. Sadly that was not our experience there. We must have had an off day. Everyone else I know who has been loves the place.

    • Hairdresser007 profile image

      James Jordan 

      10 years ago from Burbank, CA

      This place really inspired me as a teen. Would love to go there now and see it!

    • profile image


      10 years ago

      i've been twice! don't rush through the tour--take your time and stay awhile. it's well worth a visit to appreciate the beauty of and around this site.

    • profile image


      11 years ago

      I live very close, but never have been. I need to put it on my list. Rolled to my Tucson lens.

    • Kiwisoutback profile image


      11 years ago from Massachusetts

      I've never been here, but I've been close at Saguaro National Park. I've heard of this experiment before, it was plagued with problems and disputes amongst the people in it, if I'm not mistaken. Also, who can forget the memorable performance by Pauly Shore in the movie Biodome? Just kidding, that movie was really dumb, don't watch it.

      I'll definitely look this place up if I ever get the chance to get back to the Sonoran desert, it looks really interesting. Great work!

    • profile image


      11 years ago

      We've been here twice with kids while driving cross country. I recommend every stop and visit. I'd go again, but then I'm a bit of a nerd like that.

    • Aquavel profile image


      11 years ago

      I did see the Biosphere! It is fascinating. And huge! We stopped there during a trip to Arizona in '94 or '95. I thought the architecture was incredible, as was the plant life, the way the water was pumped in, and the overall concept. It was fraught with problems back then, including the fact that a monkey had unlocked and opened one of the doors that were supposed to stay locked the week before. Your lens brought back great memories. Great lens! 5*s!

    • SusannaDuffy profile image

      Susanna Duffy 

      11 years ago from Melbourne Australia

      What an incredible place! An excellent lens to bring it to our attention.

    • Stazjia profile image

      Carol Fisher 

      11 years ago from Warminster, Wiltshire, UK

      This sounds like a much larger version of the Eden Project here in the UK which I hope to visit sometime. It's a great, well written lens and beautifully illustrated.

    • KimGiancaterino profile image


      11 years ago

      Nice addition to All Things Travel.

    • profile image


      11 years ago

      Thanks for joining G Rated Lense Factory!


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