ScientificAmerican1915-01-16.jpg ThumbnailsScientific American 1918-04-27ThumbnailsScientific American 1918-04-27ThumbnailsScientific American 1918-04-27ThumbnailsScientific American 1918-04-27ThumbnailsScientific American 1918-04-27
Diver leaving a submarine to plant a mine.