Choosing Electric Motor and Battery Setup for 400kg Personal Submarine Build

This is my first post to this forum, and I not the most knowledgeable on electronics and electronic hardware, so try to be nice. I have recently decided that I would like to build a personal submarine. I understand that this is a very ambitious project that will require a lot of research and hard work, but I am a mechanical engineer, so the all the mechanic technicalities make sense. What I need help with is the electronic portion of the project. Here are some general details about my current submarine design:

1) It will fit one person.
2) It will have a mass of approx 400 kg
3) It will be partially streamlined at the front and rear.
4) I would like the vessel to be powered entirely by an electric motor and batteries.
5) I would like the propeller, motor, and batteries to be located in the rear of the vessel.
6) I would like enough battery power for approximately 1 hour of use.
7) I would like the battery to be rechargeable with a typical wall socket (like an electric car)

What I would like to know is the following:

1) What type, and how powerful of a motor should I use?
2) What type, and how powerful of a battery should I use?
3) Will I need a second/third battery to power the other electric systems in the submarine such as the fins/rudder, the interior and exterior lighting, the air and water pump for the ballast tanks, and various valves?
4) If I do need a second/third battery to power auxiliary equipment, will it have to be a different type of battery, or the same?

Any advice or guidance will be greatly appreciated. Many thanks to all

I'm no expert in electrical power for big systems, but I would think you would like some electrical isolation since the huge power draw from the motor and pumps and the inevitable on/off switching could cause some huge jumps in voltage and current due to the inductance of the electric motor and pumps. any sensitive electronics would see considerable damage due to high voltages. i would think the best way would be to give at least the motor and pumps their own power source with switches from the control electronics.

you could probably look into how electric cars are able to go the house plug-in system and build a similar system. solar car clubs from academic institutions can probably give you some guidance.

good luck!

Thanks for your reply! You bring up an excellent point. I imagine the sensitive electronic components used to control flood valves, lighting and steering controls will require a steady input, so I imagine it would be better off to have two, separate sources of power to isolate them from the 'jumpy' motor. I will also do some research on how 'plug in' electric cars store and managed their energy. You input is very much appreciate, kind sir. Many thanks.

1.) use gel battery's and you will can to find them in a shop with solar equipment.
2.) for the motor it is the best to look for a ready marine type incl. the propeller. to avoid water leaks.
3. control for the motor can be by dc/dc converter or a dc/ac converter based on the type of motor that also will give speed control.
4.) you also new ballast pumps and tanks plus level indication and valve position indication.
5.) you need compressed air tanks to blow out ballast if required and for you to have air, maybe as well a compressor.
6.) size of motors and battery you are to early in design ??? you first need to know the speed and water displacement etc.

find somebody for the electric design part this will be a 1/3 of the project.

Will you painting it yellow as well

or pink? what movie was that.....?

If you have not already done so, google "diy submarine project" and similar terms, to benefit from the experience and knowledge of others who have done this before. They will be the best people to advise you.