Ridiculously Huge Superbattleships

In NationStates, there exist a few singular ships that seem positively absurd. Several times larger than aircraft carriers and mounting guns of up to 30" bore, ridiculously huge superbattleships, such as the Onos, Doujin, and countless knockoffs of the Doujin, have no counterpart in RL.

These enormous vessels indicate vast national pride and boundless budgets, and carry with them their own strategies of naval warfare. Many carry an aircraft complement equal or greater than many aircraft carriers, and almost all claim to be practically unsinkable.