Scinfaxi-class submarine

The Scinfaxi-class submarine is a class of submarines that has appeared in two separate Ace Combat titles. It is an original submarine class created in the series.

Design
Scinfaxi-class submarines are massive; their length exceeds 300 meters, almost twice as large as a. It is the largest submarine class in existence.

The class was primarily designed as a mobile strategic missile platform, which operates on the concept of assembling a large number of numerous kinds of missiles into a single platform to turn it into a valuable launch asset. In addition to being a missile platform, Scinfaxi-class submarines can also double as underwater aircraft carriers, capable of housing numerous aircraft to protect itself from enemy attacks.

The hull of the ship is made out of highly advanced stealth materials to protect it from detection, a design choice intended to minimize the vulnerability of ballistic missiles in the post-launch stage, at which they are the most vulnerable to enemy attack.

Scinfaxi
The Yuktobanian submarine Scinfaxi, for which the class was named after, was the first of this submarine class to appear in the Ace Combat series. The submarine was developed in Yuktobania in the 1980s during the Cold War as a response to the Osean Federation's defense initiatives, which are not well-detailed.

The Scinfaxi was revealed to the world on September 2, 1991, in an event held in Cinigrad. Its combat history is unknown up until late 2010, when it was used against Osea during the Circum-Pacific War. It was utilized in two different battles using Burst Missiles before being destroyed by Wardog Squadron and the Arkbird during a failed invasion of Sand Island.

Hrimfaxi
The Yuktobanian submarine Hrimfaxi was the sister ship to the Scinfaxi. During the event in Cinigrad, a second ship with a lower development cost was mentioned, but not detailed nor fully revealed. The Osean Federation either didn't know of its existence or of its location during the Circum-Pacific War, preventing a pre-emptive assault.

Later in the war, Osean ground troops began to storm the Yuktobanian mainland in a plan involving blitz assaults to end the war in short order. On the first day of the plan, the Hrimfaxi began firing on the Osean troops from the Razgriz Straits, with Burst Missiles as its sister ship used. Wardog Squadron flew to the Straits and managed to sink the submarine after a heated battle.

Unnamed submarine
An unnamed Scinfaxi-class submarine exists in Ace Combat Infinity multiplayer missions. It is currently not named, but its class has been confirmed by a transmission from AWACS Sky-Eye during a mission. Instead of firing Burst Missiles as the Scinfaxi and Hrimfaxi did, this submarine launches Intercontinental ballistic missiles that can be locked onto and destroyed before they detonate.