There are are two penetration charts listed. One for AP and one for common.
This is the chart for common.
Armor Penetration with 105 lbs. (47.6 kg) Common Shell used on Submarines.
RangeSide ArmorDeck Armor8,200 yards (7,500 m)4.0" (102 mm)---12,200 yards (11,160 m)3.0" (76 mm)---17,000 yards (15,540 m)2.0" (51 mm)---19,400 yards (17,740 m)---1.0" (25 mm)22,600 yards (20,670 m)---1.5" (38 mm)Note: These figures are taken from armor penetration curves published in 1942.
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