How an eight-arm fictional megafloat might survive damage

How difficult would it be to sink Ace Combat's 3.7-mile, eight-arm megafloat if a structure like it existed?

Assembly from buoyant modules would imply extensive compartmentalisation, requiring widespread flooding or uncontrollable fire to sink the structure. The game's structural collapse and reactor destruction follow a different route.

The enormous fictional floating island is considered as a real engineering problem. Building and assembling it at sea would likely require individual modules to remain watertight and buoyant. That implies extensive compartmentalisation and considerable buoyancy across the finished structure. Sinking it would require uncontrollable fire or flooding beyond its ability to cope. A rough judgment suggests flooding at least five of eight arms, without a calculated stability result. The fictional structure's arms connect to one another and contain large factories and shipyard voids. The game's destruction sequence involves collapsing sections, detonating the reactor and removing a central support column. That fictional sequence is distinct from the buoyancy argument, although both involve widespread damage.