It depends if they're heading west or east. Ships heading back to the States are empty and harder to sink. Sometimes this happens with eastbound ships but rarely. T3's are easier to sink in this situation. Fire a keel shot right under the smoke stack. The whole rear of the ship will blow up and it will sink by the stern in a couple minutes.
T2's can be dealt with the same way but the sweet spot is much smaller. I never need more than one torpedo to sink a tanker.
scrapser
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