What would be the best propulsion system for this aircraft carrier?

So, I was watching a funny movie about undead pirates when the realization hit me, I never once tried to create naval superiority for my Mary Sue. Well, guess I just do it now.

Titanic 2: (n)Ice to meet you is the unholy offspring of Project Habakukk, CMF and Patrick Star.

Titanic 2 is a 1.2 kilometer long aircraft carrier, designed exclusively for UAVs. roughly 4/5 of the ship's body (not counting the conning towers) is a homogenous block of Ultra-high-molecular-weight polyethylene, "alloyed" with an aluminum-based composite metal foam, both reinforced with a hint of graphene.

Something like this. Increase length to 1.2 kilometers, width to 180 meters and double the height.

Can you sunk a plastic bag with a torpedo, or set it on fire? I dont think so!
- Anon, moments before he was set on fire.

The ship's material is buoyant, and unlike pykerete, is much lighter while providing the same, if not better, protection. Basically, Titanic 2 is too large and too simple to be sunken. Weaponized stupidity!

However, I couldn't solve propulsion. Titanic 2 is much lighter than her predescessors, as she isn't an artificial iceberg, but still very massive and I just couldn't come up with a powerful-enough propulsion system, equally as redundant as the rest of the ship.

What propulsion system (with what modifications) should Titanic 2: (n)Ice to meet you use?

Update: Since people kept nagging me about how aluminum is not suitable for this job, then FINE! I declare every instance of the word "aluminum" here to be changed to Y-alloy, a high-strength alloy that maintains its strength, even when subjected to high temperatures for longer periods of time.

posted about 5 years ago

Mephistopheles‭

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