irene and helga remained half sisters, if you were, for as long as they lived.either are alive now. but we saw one another very regularly. i learned a lot from them, you know. i certainly -- at that time, we didn't know about it and after the war we did. that made them dearer to me than ever. >> you've been on the sea, you've been in the jungles and deserts, all over the place, even under the sea. you've also experienced zero gravity and haven't done it in space but in simulation. you looked like you were having the best time of your life. tell me about it. >> that was how you train astronauts. if you go up like that you feel the swing, in the stomach, as though you're lifting on from your seat. it was breathtaking and exciting. it was wonderful and we were doing it again and then the third time. after about five times, you think, i've probably had enough of this now. they said, i'm sorry, but we have to do 35 because we're doing testing of actually drugs for seasickness. we had to go through -- after 35 times i thought that was enough. >> that's enough. >> what