http://www.interfax.ru/e/B/0/28.html?id_issue=10754142
"Space researchers and participants in the experiment will simulate a 500-day manned mission to Mars in a mock space station, to be assembled on Earth"
"The volunteers will enter a special module next year and will remain there for 500 days, going through all hardships of a long flight to the Red Planet. Many researchers argue that a long stay in outer space may negatively affect humans, causing muscle, bone, immunity and psychological disorders. The experiment will help find answers to all of these questioned"
Gravity?
Space researcher: "I knew we forgot something!"
They're probably studying group dynamics and the effects of small spaces. If they're ambitious they might be studying how well the life-support systems work, at least in theory.