In You Only Live Twice, he is in Blofeld's bunker, dressed as an astronaut about to get on the space shuttle, when Blofeld stops him.
What was his plan once he got onto the shuttle? Wasn't it supposed to blow up mid-air after capturing an American shuttle?
Also, he was caught out by Blofeld because he was going to take his portable air conditioning unit onto the space shuttle (which no astronaut would ever do). Are we supposed to assume he could have killed the other astronaut and flown the shuttle somewhere else?