Under keel or into the ship...

Originally Posted by LostDream

So keep it magnetic and dont worry "too" much about where I hit it. As stated earlier, I do like to hit the first 3rd of the ship and let the ships inertia help with the flooding of the compartment. Do I still keep a high percentage to get a one shot kill by using magnetic under the keel while aiming for the fuel tank / Ammo Storage or are those one BIG explosions only the domain of impact torpedoes?

If your magnetic torpedo is effective, it should be much more devastating than an impact, regardless of location.
How would one do damage control on a hole the size of a house IN THE BOTTOM OF A SHIP?