The realistic use, cost, and effects of a giant battleship that can submerge underwater, drive on land and fly in the sky

DISCUSSION

For my story I want to add a giant battleship that can submerge underwater like a submarine, being able to fire its weapons deep underwater, travel on water like a naval battleship, be able to travel on land and act sort of like a tank, and even fly/hover like an aircraft. I dont know if we have anything close to that in the real world but I would like to know if I could find a way to explain how it can do all those things.

The goal of this battleship is to be able to travel to any territory and be able to breach and launch an assault from underwater, on water, on land or on air. its an offensive assault type, i would say its armor is a little above average compared to its rivals but not impossible to penetrate, could you theoretically add the weapons of a submarine, battleship, tank and gunship to one giant battleship?

One thing I want to make clear is that this battleship wont be used very often, although it has a high damage output, it is slow compared to any type of aircraft, naval craft, land craft, or submarine. It can be outrun by any rival but its high firing rate, and output should make up for its speed and defense. I want to use it for invasions, and breaching defenses, it will definitely need support to intercept incoming fire, it can still breach through enemy lines and takedown several battleships, tanks, and aircraft head on but it would be a suicide mission.

A few things that I definitely want to include is:

a cannon that can fire a laser only in the air, on water, or land, it would be a very high cost of energy and be used after careful consideration;

capacity to carry and deploy 2,000 land soldiers, this might be too much or too little if we are comparing land soldiers to the men required to run this battleship (atleast 3,000) but im also considering the money, food and space required to maintain these soldiers especially since this battleship won't be used as often as other real world battleships;

angel core (nuclear) fueled engine/s, in my story the cores/hearts of angels are used as replacement for nuclear sources of energy that were used, depleted or lost during the nuclear apocalypse that marked the end of the previous era, so these new cores are more powerful than nuclear ones but are highly unstable and require very specific conditions and factors to make it usable which includes someone able to read and interpret the status of an angel core. The battleship could include one or many engines but they all have to be connected to one or several angel cores;

Top speed of 410mph, I was inspired by the ac130 because of its 'angel wings' and thats where the whole idea of angel powered aircrafts came from so I think it would be appropriate to limit the battleship top speed to be similar to the ac130. Its not meant to fly like a fighter jet but like a gunship attacking a naval or land enemy;

(Optional)

I am thinking of making the battleship somewhat sentient like the Eva's in NGE, its body might be restrained and even merge with the structure of the ship or its heart might need to 'sleep' after every battle so the energy stores can be renewed.

Feel free to share your ideas and critique.

Posted Jul 3, 2026, 6:21 PM UTC

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