Der Kommandant said:
didnt they used to ram ships with submarines?
oh wait... that was 20,000 leagues under the sea... n/m
Actually, they did, in a sense. The first incarnations of subs weren't fully submersible. They skimmed along with the very top of the ship 'level' with the top of the water. The ship had a long spar with a powder keg on it. You rolled up to the ship, stuck the spar in it, lit the fuse and backed away. If you were lucky, the wave from the explosion wouldn't wash enough water into your hull as to make you sink. Considering the time, it was risky, but effective. I don't think it ever got widespread use. In fact, I think it was only used once and the thing did sink. Interesting concept nontheless.
BS