DIAGRAM OF TYPE 214 SUBMARINE

[aukepalmhof]

The diagram in the margin of this MS shows us a Type 214 submarine, made for the export.

Type 214 is a diesel-electric submarine developed by Howaldtswerke-Deutsche Werft GmbH (HDW). It features diesel propulsion with an air-independent propulsion (AIP) system using Siemens polymer electrolyte membrane (PEM) hydrogen fuel cells. The Type 214 submarine is derived from Type 212, but as an export variant, it lacks some of the classified technologies of its smaller predecessor, the most important of which is probably the non-magnetic steel hull, which makes the Type 212 submarine difficult to detect using a magnetic anomaly detector.[citation needed]
A contract to build three boats for the Hellenic Navy was signed 15 February 2000 and a fourth unit was ordered in June 2002. The first boat was built at HDW in Kiel, Germany, and the rest at the Hellenic Shipyards Co. in Skaramangas, Greece. The Hellenic Navy named them the Papanikolis-class.
The Republic of Korea Navy has ordered nine Type 214 submarines, designated as Son Won-Il-class, to be built in Korea by Hyundai Heavy Industries and Daewoo Shipbuilding & Marine Engineering; three first batch models had entered service since 2007, and six-second batch models will enter service from 2012.
Due to improvements in the pressure hull materials, the Type 214 can dive nearly 400 meters It can also carry food, fresh water, and fuel for 84 days of operation.

General characteristics
Displacement: 1,690 t surfaced / 1,860 t submerged
Dimensions: length 213 feet 3 inches (65 m) / beam 20 feet 8 inches (6.3 m) / draught 19 feet 8 inches (6 m)
Pressure hull: HY-100[6]
Armament: 8 x 533 mm torpedo tubes, 4 subharpoon-capable
Propulsion: low noise skew back propeller
Diesel engines: 2 x MTU 16V-396 (3.96 MW)
Charging generators: 2 x Piller Ntb56.40-10 0.97 MW
AIP system: 2 x HDW PEM fuel cell module BZM120 (120 kW x 2)[7]
Electric motor: 1 x Siemens Permasyn (2.85 MW)
Speed: 10 kn surfaced / 20 kn submerged
Speed on fuel cells: 2-6 kn estimated
Range surfaced: 12,000 miles (19,300 km)
Range submerged: 420 nmi @ 8 kn (780 km @ 15 km/h)
Range on fuel cells: 1,248 nmi @ 4 kn (2,310 km @ 7 km/h)
Mission endurance: 12 weeks
Submerged without snorkelling: 3 weeks
Operating depth: more than 250 m (820 feet) officially, 400 m estimated (1312 feet
Complement: 5 officers + 22 crew
Navigation radar: SPHINX-D with 4 kW pulse and tactical LPI radar sensor [Thales Deutschland Kiel.

https://en.wikipedia.org/wiki/Type_214_submarine
Chad 2017 1000F sgMS?, scott? (the submarine on the stamp is the U-34) viewtopic.php?f=2&t=17147&p=20363&hilit=U+34+S+184#p20363
The Chad issue is illegal and it is not a stamp.