The Martians: NASA researchers to simulate Mars life in active volcano

The Hawaii Space Exploration Analog and Simulation (HI-SEAS), a $2-million joint venture between NASA and the University of Hawaii, is built atop Mauna Loa, the world's largest active volcano, chosen because it has a rocky red geography similar to Mars.

Although they will not leave Earth, the researchers will be placed under circumstances that simulate life on Mars. If they leave the compound, they will wear space suits, and their diet will consist primarily of freeze-dried foodstuffs.

The six researchers will have no direct contact with their surroundings. They will be able to communicate with the outside world, but with a twenty-minute delay (the same amount of time it takes a message to reach Earth from Mars). The only outside material to enter the testing ground will be through the use of a resupply robot.

Biometric collars have been issued to the researchers to monitor mood and proximity to the rest of the team. NASA hopes to learn more about the effects of isolation and confinement on the human mind. 

The research team to be locked within Mauna Loa was chosen from a group of 700 applicants based on the results of cognitive and personality tests, as well as extensive interviews. 

Biosphere 2 was a closed ecological system built in the 1990s to demonstrate the viability of man-made environments for supporting human life. The ambitious project was plagued with difficulties, one of which was that the researchers sealed inside succumbed to cabin fever and fought among themselves.

Humans are known to undergo severe stress when placed in unfamiliar and isolated surroundings. Living in harsh conditions, 19th-century American pioneers were known to suffer "prairie madness" when they found themselves thousands of miles from civilization, causing them to become depressed, withdrawn, violent, and even suicidal.

The latest expedition is the fifth HI-SEAS mission. A sixth is planned for 2018. The previous mission within Mauna Loa ended in August 2016, and lasted one year, the second longest Martian simulation to date.

The longest, lasting 520 days, took place in 2011, in a joint collaboration between the European Space Agency, the China National Space Administration, and Roscosmos.