Here Was my entry for the SIG If it floats, I am building the Revell Class 212 the Italian Navy version.
The Italian version of Class 212 is call Torado Class, the sub has a Diesel engine and Air-independent propulsion (AIP).
When the AIP engine is running it a slow cruising but...the system is vibration free and very quite so... virtually undetectable
Some General characteristics (Source from Wikipedia)
Displacement:
1,450 tonnes surfaced, 1,830 tonnes submerged
Length: 56 m (183.7 ft), 57.2 m (187.66 ft) (2nd batch)
Beam: 7 m (22.96 ft)
Draft: 6 m (19.68 ft)
Propulsion:
1 MTU 16V 396 diesel-engine
9 HDW/Siemens PEM fuel cells, 30–40 kW each (U31)
2 HDW/Siemens PEM fuel cells 120 kW (U32, U33, U34)
1 Siemens Permasyn electric motor 1700 kW, driving a single seven-bladed skewback propeller
Speed: 20 knots (37 km/h) submerged, 12 knots surfaced
Depth: over 700 m (2,296 ft)
Range:
8,000 nautical miles (14,800 km, or 9,196 miles) at 8 knots (15 km/h)
Endurance: 3 weeks without snorkeling, 12 weeks overall
Armament:
6 x 533 mm torpedo tubes (in 2 forward-pointing asymmetric groups of left 4 + right 2 ) with 13 torpedoes or 24 tube mines
IDAS missiles
24 external naval mines (optional)
Countermeasures:
Torpedo defence system Tau, 4 launchers, 40 jammers/decoys
Sensors:
STN Atlas DBQS40 sonar suite:
TAS-3 passive low-frequency towed array sonar (deployed from sail)
FAS-3 passive low-, and medium-frequency hull-mounted flank array sonar
MOA 3070 mine detection sonar
Crew complement:
23–27 (incl. 5 officers)
Heres nice cutout of the boat.

Here are some images of Italian version






















































