Hole in the enemy ship question?

[Col7777]

I was recently in a mission and put 2 large holes in the hull of a BB, I had to dive for cover but I watched on free camera.

I followed the BB with the camera, the sea was choppy so it was swaying/rocking side to side.
One hole was partly under the water the other went under as the ship rocked, I thought surely she is taking in water and would start to sink, but it sailed on forever, I gave up watching in the end.

Was it because it was a BB and they are not meant to sink with just 2 torpedoes?

Col.