Last night I wandered into a large convoy and right smack in the middle of the thing was a Revenge BB! :p
I fired a spread of 4 at the BB and managed to scored at least 3 side impacts... she went down fast. WooHOO! First ship to go was a 31k ton man-o-war.
I spun around and right there on my 180 was a nice whaling ship. Launched my last fish and dove to 80m. Scored a side impact on the whaler midship and caused a little fire to start. Seemed unlikely that I would sink such a large ship with a single side impact, but while reloading at 80m the fire on the whaler grew to an absolute inferno! The entire ship was a raging fireball, no one could've survived that! It sank as a result of the fire.