cut off from the outside world with little equipment and even fewer comforts mathias moller spent 6 days in the darkness of this cave in italy to help him prepare for the regulars of space he learned how to explore unknown surroundings and how to conduct scientific experiments underground. and joins us now mathias welcome to your also having to stay home these days how is your astronaut training helped at all. yesod i'm quite prepared for the isolation i mean i lived in a cave for several days i lived also on the water for 16 days in a very tiny confined environment with other people and we got pretty well along each other well what would you say the hardest part was then that was it communication was it the cabin fever or in your case the key fever or something else completely well it's living together with other people like in a confined environment for an extended period of time and it's even a little bit more complicated because once we're in space we will lift there for 6 months we all come from different countries speak different languages have a cultural background which is differ