As Steppenwolf leaves the trench, he uses lifeboat and floats up into the submarine carrier.

Pre-order rewards include a Zippo lighter replica from 1941 and a scale model of the I-601 submarine carrier.

Later in the series, Japan deploys the Naruto class - 12 submarine carriers that form into a giant mobile offshore base capable of housing other submarines and Rufe floatplane fighters.

There are no known submarine carriers in use today, but several concepts exist that could provide a design in the future allowing an attack force to move entirely underwater, attack without warning, and vanish again.

It is arguable conversion of Centaur to an anti submarine carrier would have been more relevant given the new NATO focus of the time, however she was consigned to the role of accommodation ship for the crew of HMS Victorious while the latter ship undertook a refit.