About Guy Hamilton: Guy Hamilton is a French-born English film director. He directed 22 films from the 1950s to the 1980s, including four James Bond films.
My guess is that if they now choose to change of director for every other film, it's just because you can't really change the formula, you can merely try to film it your way.
For years, I've been wondering what could happen to nuclear submarines when they dive and disappear from the surface of the earth for months, without a trace. No one really knows where they are.