How to improve one-torpedo sink rate ?

[Oleander]

Originally Posted by Trevally.

Keel shots = 1-3m below the keel (use magnetic and TDWs fix)

Every time I try a keel shot at those depths it goes straight under without exploding.

I usually hit tankers just behind the wheel house and let them sit, they usually go down after a bit from fire damage and flooding. Unless I want to hit and run then I put one there and one in the bow so it can sit and take on water helplessly.

Everything else gets hit behind the stack and that usually takes them down with one shot.