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FNS F-134 Class

The F-134 (Tammi) Class submarine is a successor to the FNS Koivu class submarine. Leevi design bureau deemed that it was important to keep the submarine fleet up to the current standards and so they began the development of the F-134 class. The new sub would have over 3 times the displacement of the koivu class and feature many recently developed modern technologies.

However, the development stage lasted for too long and by the time the construction of the first sub was complete, the design was outdated. During early stages of development there had been too few blueprints of the sub made which resulted in unneccessary complexity and problems in the subs structure.

The final product has the vast majority of these problems solved and was accepted to service because developing a new submarine again was deemed too expensive and time consuming.

Technical specifications:
Displacement: 19.7 tons
Powerplant: 8 Advanced medium sized watercooled diesel engines supported by 2 small underwater generators running their own ozygen supply. 1 Large electric motor for underwater operations.
Energy storage: 6 large battery units supported by smaller storage units. 26 000l of diesel fuel.
Energy production: 900 w + 150 w
Top speed of 22m/s and 15m/s in fuel saving mode.
Max dive depth: 400m

Features:
Automatic depth holding
Spotlights and cameras for underwater operations
Watertight compartments with watertight doors
Semi-automatic fire suppression system for the main powerplant supported by handheld equipment
Access to every corner of the sub for making repairs