Corrected entry: If you look at the sub in its side shots, the lights on the side appear to be a smiling face.
Corrected entry: The title is impossible! For starters, a league is a horizontal distance measurement, ie. length, not depth. In addition, I'm not exactly sure, but I believe it would be a length of about two and a half times around the earth. So, it would be utterly impossible to travel that far under the sea even if it was a depth measurement.