If you launch countermeasures, go here
From Create Your Own Story
You launch the countermeasures and order the ship to go all ahead full toward the massif. Maybe you can make a turn before the massif and distract the torpedo away. The torpedo has reached countermeasures and it looks like the countermeasures are working. For a few seconds, the torpedo has lost contact but it finally reacquires. You do buy yourself some 15 seconds to move, with 27 seconds to the massif.
The torpedo has closed in within 20 seconds of the ship. It is time to turn. The massif is directly ahead and you need to turn left or right with full rudder strength.
