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Submarines2022–present
Attack submarine
Riachuelo-class submarine is a attack submarine. It was built by ICN. Reported operators include Brazilian Navy.
Riachuelo-class submarine
Marinha do Brasil · CC BY-SA 2.0 · Resized · CC BY-SA 2.0 · Source ↗ · ModifiedRiachuelo class
ICN
Brazilian Navy
Tupi class
US$ 1 billion per unit (diesel-electric) US$ 3.8 billion per unit (nuclear)
2010–present
2022–present
5 (1 nuclear)
1
4
3
Attack submarine
Diesel-electric: 1,900 t (1,900 long tons ) Nuclear: 6,000 t (5,900 long tons)
Diesel-electric: 70.62 m (231 ft 8 in) Nuclear: 100 m (328 ft 1 in)
Diesel-electric: 6.2 m (20 ft 4 in) Nuclear: 9.8 m (32 ft 2 in)
Diesel-electric: 4 × MTU 12V 396 SE84 diesels 1,500 hp (1,119 kW) each 1 × Jeumont-Schneider EPM Magtronic electric 3,909 hp (2,915 kW) 1 × Shaft Exide Hagen batteries Nuclear: 1 × Pressurized water reactor, 48 MW (64,000 hp), LEU 20% 1 × Nuclear turbo-electric engine 1 × Shaft
Diesel-electric: 21 knots (39 km/h; 24 mph) Nuclear: 25 knots (46 km/h; 29 mph)
400 m (1,300 ft)
Diesel-electric: 32 Nuclear: 100
Naval Group SUBTICS combat management system Thales TSM 2233 Eledone hull and flank array passive sonar Thales Safare/S-Cube hull active sonar Safran Series 20 target identification and classification system
Thales DR 3000/ITT AR 900 electronic support measures Naval Group Contralto-S decoy launchers CANTO anti-torpedo countermeasures
6 × 533 mm (21 in) torpedo tubes : 8 × SM39 Exocet anti-ship missiles 18 × F21 heavy-weight torpedoes 30 × naval mines
Sources:
The Riachuelo class are a Brazilian class of diesel-electric and nuclear-powered attack submarines developed by the state-owned shipyard Itaguaí Construções Navais (ICN), based on the French Scorpène class as part of the Submarine Development Program .
Reference text from Wikipedia contributors, used under CC BY-SA 4.0.
True scale
Sourced dimensions beside a 1.75 m human reference.
Points represent sourced observations, including revisions. Revisions on the same effective date are not separate inventory events. Ranges appear in the table and are not plotted as exact points.
| Observation / report period | Value | Source | Claim state |
|---|---|---|---|
| 28 Sept 2026 | 70.62 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 70.62 m | Wikipedia contributors | approved |
Riachuelo-class submarine equipment records. Variants, orders and quantities are shown as reported in each inventory source; coverage is incomplete.
BrazilRiachuelo-class submarines incorporated into the Brazilian Navy's operational sector by 31 December 2025: Riachuelo, Humaitá and Tonelero. Excludes the fourth vessel, Almirante Karam, which the report records as launched but not delivered. This is the operationally incorporated class fleet, not all Brazilian submarines or an at-sea availability count.