" He became quiet. It is always a special moment when you raise a submarine's periscope, because that is when you find out where you are. You hope that you have come up in the right place, but you can never be absolutely sure. So if your hands shake a little as the periscope rises above the waves, and if you feel your heart thump a bit more loudly, then that is entirely normal. "

― Alexander McCall Smith , School Ship Tobermory (School Ship Tobermory, #1)