Based on the clue 'all aboard there are over 700 miles of this under...', what is the answer?

What is associated with: all 6 examples of his signature known to exist date from between 1612 1616? What is associated with: all 6 noble gases were discovered on earth between 1894 1900 this one symbol rn was the last? Based on the clue 'all 6 of the 1st class of women astronauts hold a ...', what is the answer? Based on the clue 'all 7 of his novels featured detective philip marl...', what is the answer? Based on the clue 'all aboard this length of material at the back of ...', what is the answer? Based on the clue 'all about eve fasten your seat belts its going to...', what is the answer? Based on the clue 'all about eve was the film in which davis warned f...', what is the answer? Based on the clue 'all algae contain this green pigment that allows t...', what is the answer?