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| Names | Builders | Completed | Losses | Transfers | Discarding |
|---|---|---|---|---|---|
Матрос Пётр Кошка [Matros Pyotr Koshka] |
Baltic Wks, Kronshtadt: Matros Pyotr Koshka |
7/1904: Matros Pyotr Koshka |
none |
none |
1/1908: Matros Pyotr Koshka |
| Displacement standard, t |
|
|---|---|
| Displacement normal, t | / 20 |
| Length, m | 15.2 |
| Breadth, m | 1.27 |
| Draught, m | 1.10 |
| No of shafts | 6 amidships |
| Machinery | 6 electric motors |
| Power, h. p. | 24 |
| Max speed, kts | 8.6 / 6 |
| Fuel, t | battery only |
| Endurance, nm(kts) | 40(4) / 15(3.5) |
| Armament | 2 - 381 TT (1 bow, 1 stern) |
| Complement | 3 |
| Diving depth operational, m | 20 |
Top secret midget submarine designed by E. Kolbasyev.
None.
This very unsuccessful midget arrived Sevastopol by railway in 1904 but never was really commissioned.

