The SSV Papanikolis is based on real life Y/B Papanikolis (S-120) type 214 class.

It features diesel propulsion with an air-independent propulsion (AIP) system using polymer electrolyte membrane (PEM) hydrogen fuel cells. It is also equipped with a hoistable radar mast which does not penetrate the pressure hull of the submarine.
The radar sensor is a FMCW transceiver which can't be detected by ESM systems in medium terms. This technology is so called LPI radar, which means "Low probability of intercept". The transmitting power is lower than the power of a mobile phone but the resolution more precise compared to high power Pulse radar.

__Controls:__
VTOL -> Submerge Vessel
Trim -> Radar Mast
Throttle -> Engine Thrust

__Activation Groups:__
1 -> Lights