The Soviet Typhoon-class submarines were the largest ever built—massive underwater titans with amenities like a pool and ...

Lavish submarines for the niche sector known as "luxury adventure," as well as luxurious cruise ships, have gotten their share of criticism over the years from green activists and everyone who ...

The "XXLUVs" can likely be loaded with significantly larger payloads than the U.S. Navy's Orca, which is also undergoing testing.