"The Unknown Sub"

Written by Jerry Siegel (writer), Maurice Kashuba (artist)

Published in Detective Comics #35, January, 1940, 6 pages.
The pleasure boat Swelltime was out on a four-hour cruise of music and enjoyment when it is torpedoed by a submarine. The suspected culprit is the antagonistic nation of Luxor. Bart Regan decides to trail that country's ambassador which will lead him to a lot of scuffles and gun battles and eventually an elaborate hidden submarine facility.

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