Akula from Engel is very complete model. The kit comes with:
• Hull isl made of GRP  all other parts  in resin.
• Drive unit complete with motor, gear box, coupling, shaft, bearing and brass scimitar prop.
• Accessories such as linkeages, screws, seals etc.
• Complete diving system consisting of two 500ml piston tanks and switch unit
• Plans 1:1 (see as PDF) and instructions in English
• Further Options include Conning Tower Mechanism and Retractable Front Dive Planes

ELECTRONIC :

The kit offer two different electronic control  systems:

TAE with AutoStop, AutoTrim  with FailSafe and pressure switch.

TAES, with also STATIC DEPTH CONTROLLER