Those of you saying "nuke in space lol" don't understand that in space, a nuclear explosion does not act the same way as it does in atmosphere. A nuke in atmosphere does most of its damage from the shock of the blast wave, overpressure, and eventually radiation and fallout. In space, the only thing that would do damage from a nuke going off is the burst of gamma rays.
At the center of a nuclear blast, where the overpressure is about 13 psi, only the strongest structures: reinforced concrete and bunkers and whatnot, still have some semblance of their original shape. Everything else is literally flattened by the overpressure. That's a mere 13 psi over normal atmosphere at sea level, which is about 14.7 psi. Every 33 feet deep in water you go (on Earth) you add another atmosphere of pressure. Steel hulled submarines can go to about 540psi. No spaceship that we have or likely ever will build can withstand that. That's an absurd requirement for a spaceship.
Anyways, as was said earlier, in a "liquid" system, unless some force was acting on it, it'd form into droplets and there would be no pressure. Still, have you thought about what this system would be like at the edges of the liquid-y part? Because liquids will boil into vapor in space, not to mention dissipate because there's nothing holding them together except maybe gravity.
So with that all being said, I'm against this idea. This is a spaceship computer game, not a submarine computer game.