| Lead Boat: SS-172, U.S.S. Porpoise |
| Length: 301' |
| Beam: 24' 11" |
| Draft: 13' 10" (Surface trim) |
| Displacement: 1,300 tons (surfaced); 1,900 tons (submerged) |
| Speed: 20 knots (surfaced); 9 knots (submerged) |
| Diving Depth: 250' (test depth) |
| Range: 22,000 miles |
| Endurance: |
| Crew: 5 officers, 49 enlisted |
| Deck Gun: 1-3"/50-calibre |
| Anti-Aircraft Weapons: |
| Light Weaponry: 50 & 30 calibre machine guns |
| Torpedoes: 4-21" torpedo tubes (bow), 2-21" torpedo tubes (stern), 16 torpedoes |
| Engines: 4-1,300 hp main diesels, 3-100 kw auxiliaries |
| Motors: 4-521 hp |
| Radar: |
| Sonar: |
| Wartime Modifications: |
