U.S. Coast Guard catches a narco-submarine filled with cocaine and marijuana, and a U.S. soldier jumps onto the submarine and...punches it! I didn't even know people still smuggled weed into America. What's next - beer? To be accurate, I don't know if these homemade watercraft are really "submarines"; I think they're more accurately called "semi-submarines". 0:59 video:
Here's a nice infographic describing the history of captured narco-subs.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...c_fullsize.jpg
Submarine drone captures lionfish - video
Submarine cutaway - photo
Submarine cable cross-section - photo
The H.L. Hunley, the first submarine to sink a warship