If you think logicaly an engine in a torpedo can be likened to an engine in your car.
If you have a full tank of gas and drive at your cars top speed untill you run out of fuel, you will arrive at your destination quickly but you wont have travelled far.
If you drive there slowly you arrive at a later point in time but your petrol lasts longer and gives your car a greater distance travelled.
Therein lies the torpedo equation!
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"In the crushing depths of the ocean, lies safety"
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