UNDERSEA ARMS RACE: China is developing a warship of naval theorists’ dreams.

There are two concepts in circulation: one is a high-speed warship with much of its hull submerged but otherwise has a functional superstructure with defense weapons and radar, the other is almost completely submerged arsenal ship with two conning towers. The scale of the designs are significant; either ship would displace roughly about 20,000 tons at full load.

Reports claim there has been substantial design work and concept proofing for this underwater arsenal ship. Even on his deathbed, leading naval engineer Professor Dong Wei Cai continued to work on a key aspect of the arsenal ship design: the high-speed wave hydroplane.

For stealth operations, the arsenal ship would have most of its hull inherently submerged, with only the bridge and a few other parts of the ship above the waterline, reducing the radar cross section. But when traveling with a high-speed naval taskforce, the arsenal ship will sacrifice stealth to use its flat hull bottom to hydroplane at high speeds, cutting across the waves like a speedboat or amphibious armored vehicle.

The second design is more conventional, it is essentially a giant, conventionally propelled submarine with two conning towers stuffed with snorkels, periscopes, and communications antennae. Given its need to keep up with high-speed surface ships and its lack of high-speed endurance underwater, this arsenal ship design would operate similarly to WWII submarines; the majority of its voyage will take place on the surface, and will submerge only during combat and under attack.

China is going to have to get much better at silencing to make something like this work.