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I have been researching the possibility of living on Mars for several years. But it took an invitation to give a talk about space at HMP Erlestoke in England—a category C men's prison—to make me realize that there are a surprising number of similarities between the challenges that would be faced by would-be Martians and daily life in jail.

The talk was part of a . As I discussed the parallels between Mars and prison with those incarcerated at HMP Erlestoke, the men agreed with me that, despite seeming so different, they would both share long-term isolation, confinement and psychological challenges (not to mention bad food).

So, as plans for exploration of Mars advance and we consider how to survive on this distant and hostile world, could there be important lessons from an environment closer to home—the modern prison? Understanding this overlap could be critical for ensuring the well-being of those we send to Mars. We know the terrible conditions of prisons can have a severe impact on people, and perhaps we can learn from that to help keep others safe and well.

It's important to recognize the fundamental distinction between prisons and space exploration. Prisons are a punitive measure, depriving individuals of their freedom, while space exploration is a highly selective, paid endeavor undertaken by choice. As I saw, living in prison is a profoundly challenging environment. Despite legal minimum standards, overcrowding and shortages mean many prisons fail to uphold them.

The profoundly negative impact of poor prison conditions highlights the urgent need for effective solutions. But the knowledge gained from this could also then help support people in other challenging and remote environments, such as space exploration.

We have many years' experience of from isolated, confined and extreme environments such as submarines, polar research stations, space simulators on Earth and . But few people have looked to the public prisons on our doorstep for what we can learn.

Extreme routine

Daily life in both a prison and in space is governed by structured routines. In prisons, days down to the minute, dictating everything from waking to sleeping. This rigid scheduling is mirrored by mission-controlled timetables for astronauts.

Mandatory work is another common thread. Prison routines often , such as kitchen or laundry duty, which serve the needs of the facility. Similarly, Martian astronauts would need to perform scientific experiments, equipment maintenance and resource production duties. Mandatory work can sometimes lead to resentment if there's little autonomy.

Basic food and limited sleep is another common factor. When I asked the inmates what the food was like, they laughed. A staff member explained that the budget is £3.08 per person (the is even less at £2.70 per person per day). Prison food can be and meal times are fixed, impacting both health and morale.

On Mars, astronauts would consume carefully planned dehydrated meals, which would no doubt have a higher budget and be nutritionally richer, but it is not as good as freshly cooked food back on Earth.

Sleep, a fundamental need, can also be elusive in both environments. In prisons, it can be . Astronauts aboard the International Space Station are continuously exposed , which is equivalent to the sound of motorway traffic from a distance of 15 meters.

Limited space

Prison cells are famously small, often measuring little more than a few square meters, and frequently housing several people. They offer minimal personal space and little privacy. The —if it's upheld—is a minimum of four square meters per person in a single cell.

Similarly, Martian habitats, designed to function with the minimum resources and with a focus on life support, .

For example, the Apollo Command and Service module which went to lunar orbit for three astronauts. This lack of personal space and privacy in both settings can lead to heightened stress levels and challenges to emotion regulation.

Both places also provide a potentially high-risk environment. The threats may be different—often interpersonal in prisons—from violence, sexual assault, and extortion to potential staff abuse-, mainly environmental—radiation, cold and lack of air on Mars. But they can lead to a persistent state of vigilance which can significantly impact mental well-being in both cases.

Dealing with isolation

Perhaps the biggest parallels lie in the psychological challenges arising from prolonged isolation. Imprisonment involves a significant separation from family, friends, and the outside world, feelings of isolation and loneliness.

While astronauts on a mission to Mars are highly trained professionals and have chosen to go, they too will operate under a significant degree of control. With a likely round trip time of two years, astronauts embarking on a mission to Mars may also experience isolation. This could lead to feelings of disconnection and homesickness, as in volunteers on Earth.

Prisoners experience a over even the most basic aspects of their daily existence. You can see the importance of feelings of control in the fact that even astronauts and cosmonauts sometimes rail against or even disobey mission control's strict guidelines, as the NASA astronaut Clayton Anderson has written about in his candid book .

Social dynamics

Both groups require living in close quarters with a limited, unchanging set of companions. In prison, people are confined to a relatively small social environment, which can lead to complex subcultures and the potential for interpersonal conflict and violence, though supportive relationships can also be a crucial resource.

Equally, for Martian crews, strong group cohesion and mutual support . However, the inherent stress of the mission, confined living conditions and significant communication delays with Earth .

So we see that lessons learned from studying the experiences of people in jails can provide valuable insights for mitigating the negative impacts of life on Mars.

Strategies such as designing habitats to maximize personal space and privacy, improving food and maximizing autonomy will be needed for Martian travel. It will be important to provide access to meaningful activities to combat monotony, ensure access to comprehensive mental health support and fostering strong social connections and support networks. These have all been studied in prisons.

By trying to improve prison conditions and continuing to learn from prisons, we can better prepare our pioneers for the unprecedented challenges of making a home on Mars, improving their chances of survival and their ability to thrive.

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