It's been 18 months since we last covered it - and they're only just setting off - but the Mars 500 project kicks off today in Moscow.
6 would-be astronauts will be sealed inside a simulation space capsule to document the effects of an 18 month round trip to the red planet. The simulator even includes a mock-up of the planet's surface - so the effects of EVA can be studied after the 6 month feet-up session.
One thing that has changed in 18 months is the arrival of Twitter - which Italian pseudonaut Diego Urbina will be updating during the trip. The mission also has a blog.