October 11th, 2010
02:13 PM ET

Ascent could bring health risks to miners

Work to rescue 33 miners from a copper mine 2,200 feet below Chile's Atacama Desert is about to take a dramatic turn.

The first miners could be pulled from the mine as early as Tuesday evening.  Chilean Health Minister Jaime Manalich says they are in good spirits and, overall, in very good health. However, some of the men have shown signs of anxiety and some have had minor cardiac issues, Manalich added.

The miners will be switched over to a liquid diet six hours before they begin their trip to the surface in case they vomit on the way up. The rescue capsule will spin as it rises to the surface, possibly causing dizziness and even panic.

MIR astronaut Jerry Linenger knows something about isolation and confinement. He says his five months in space left him weak and with bone loss. "Down in the mines you have gravity pulling you down. There will be disorientation–turning your head will feel like doing 100 backflips in a row," he said.

Chilean Mining Minister Laurence Golborne is concerned about the miners being re-introduced to sunlight abruptly. Special sunglasses have been sent in an effort to make sure the miners don't suffer damage to their retinas.

The miners have been monitored very closely since they were first trapped on August 5.  The miners were given special shirts and shorts that pull sweat away from the body due to concern about skin infections.  They're also wearing special socks that help prevent athlete's foot and other fungal infections. They've even had a series of vaccinations including a tetanus booster and flu shot to help boost their immune systems.

The men have been exercising for an hour a day.  One of the miners, Yonni Barrios, is a paramedic and has been weighing his fellow miners daily, taking  blood tests and doing daily urine analysis.  That information is downloaded to a Palm Pilot that has been sending the information back to the surface so that medics and personal trainers can check to make sure the miners are well.  They have been tailoring the miners' exercise routines to the day's figures.

Dr. Bailus Walker, an environmental and occupational medicine expert at Howard University Medical Center, says one concern is the effect the barometric pressure will have on their bodies as they're brought up. "You'll see muscular aches and pains in the joints called 'the bends' as a result of the decompression. You could see some respiratory difficulties called 'the chokes.' You'll see increased blood pressure, and some lung damage–but the adequate supply of oxygen should keep lung problems at a minimum."


The bends, also known as decompression sickness, is a painful condition usually seen in deep sea divers surfacing too quickly. It can also occur when descending from high altitudes. Nitrogen bubbles can form in the blood and tissue when the pressure around someone in the air or water changes rapidly.

James Polk, NASA's deputy chief medical officer, says his agency considered decompression sickness but because the miners were at sea level, found the risk to be very low. "We did the calculations. We found the risk was negligible."

The addition of oxygen in the escape module will also decrease the risk for any nitrogen bubble formation, he said.

Experts say psychological adjustments will be a huge factor. "These men spent 20 days totally cut off in the dark until the first bore hole was made," Linenger said. "So they were in survival mode, which is tough psychologically because you are in a life and death situation."

Once out, the miners will be examined on site and hospitalized for a mandatory two days.  During that time  they'll be monitored and receive physical and mental health care. Doctors will keep an eye out for things like nightmares, panic attacks, anxiety and claustrophobia, among other potential issues.

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