Norfolk, you might enjoy this pic. Purely hypothetical and fictional. But in the course of the major war described in mu novel series, a wholly submersible Amphibious Assault and Carrier Strike Group is developed. Here's a rendering of the same:... while I reject the notion that the submarine can replace the aircraft carrier, I still believe that submarines should be given priority for resources over aircraft carriers to the extent that once sufficient resources have been made available for a submarine force capable of defending one's coasts, only then is it time to allocate the resources necessary to develop power-projection capabilites based upon carrier strike groups.
That's a 40,000+ ton submersible aircraft carrier (with two EMALS), a 40,000+ ton submersible Amphibious Assault vessel, a SSGN, and a Seawolf and a Virginia class for escort duties.
Imagine several of those submarine carriers and amphibious assault vessels arriving and surfacing, wholly unannounced and unknown off a hostile coast.
Anyhow, just for your interest. FYI, there is a good thread about that book series here on SD HERE